JP2002174794A - Optical scanner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical scanner which has a simple configuration and can carry out stable scanning even when acceleration due to disturbance acts on the scanner. SOLUTION: A supporting part 30 which supports a moving part 20 freely oscillatably is constituted by using first and second springs 32 and 34 provided with a folded region used for fixation to a housing 10 and the moving part 20. By fixing both springs 32 and 34 so that the ridgeline parts formed by folding are disposed close to each other, the orientation axis i of the ridgeline part serves as the center of rotation of the rocking movement of the moving part 20. The folded springs 32 and 34 have such a structure that the rigidity against deformation in the direction other than the rocking direction of the moving part 20 is high and that unnecessary vibration which disturbs the scanning locus cannot be generated easily. Furthermore, the center of gravity of the moving part 20 is made to coincide approximately with the orientation axis i so that the moment which disturbs the vibration of the rocking direction used for the optical scanning of the moving part 20 is not generated even if acceleration due to disturbance acts on the scanner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a laser scan type bar code reader, a laser scan type obstacle sensor, etc., reflects light from a light source, and performs one-dimensional scanning using the reflected light. Related to an optical scanner.

[0002]

2. Description of the Related Art Conventionally, in a laser scan type bar code reader, a laser scan type obstacle sensor, and the like,
As a low-cost optical scanner used for scanning a laser beam, for example, as disclosed in JP-A-9-138366, a mirror-finished magnet is supported by a torsion spring, and an alternating magnetic field is externally applied. By operating the torsion spring, the magnet is swung in a twisting direction, the incident light from the light source is reflected by a mirror surface, and scanning is performed using the reflected light from the mirror surface. ing.

[0003]

By the way, in such a conventional apparatus, in order to obtain a wide scanning angle, the diameter of the torsion spring is reduced (here, 140 μm) so that the torsion spring can be sufficiently elastically deformed. There must be.
However, the small-diameter torsion spring is easily deformed not only in the torsional direction required for scanning but also in the extending direction and the bending direction.
The magnet supported by the torsion spring has many possible directions (degrees of freedom of vibration) in addition to the torsional direction used for scanning.

For this reason, when the above-described conventional apparatus (optical scanner) is used in an environment where strong disturbance acceleration acts, for example, for use in a vehicle-mounted device, various vibration modes corresponding to the degree of freedom of these vibrations are excited. As a result, there is a problem that the scanning trajectory is disturbed.

Accordingly, an object of the present invention is to provide an optical scanner capable of performing stable scanning even when a disturbance acceleration acts, in order to solve the above problems.

[0006]

In the optical scanner according to the first aspect of the present invention, the housing has a pair of arms arranged adjacent to each other, and the movable portion is attached to the housing. The supporting portion that swingably supports the pair of plate-like elastic bodies.

In each of the plate-like elastic members, a housing fixing piece in which a folded portion formed at the tip is fixed to one of a pair of arms, and a folded portion formed at the tip is fixed to a movable portion. And a ridge portion formed on the housing fixed piece and the movable portion fixed piece is arranged on a single axis by providing the folded portion.

[0008] The pair of plate-like elastic members configured as described above is disposed between the pair of arm portions with the ridge portions thereof being close to each other, and is centered on the arrangement axis where the ridge lines of both plate-like elastic members are arranged. The movable portion is configured to swing. Accordingly, the support portion has a high rigidity against deformation in the direction along the ridge portion, that is, in the direction along the array axis that is the center of the oscillating motion. The rigidity is low with respect to the deformation in the swinging direction of swinging.

Therefore, according to the optical scanner of the present invention, it is possible to sufficiently suppress the occurrence of unnecessary vibration modes other than the swing direction in the movable portion. Stable scanning can be performed without disturbing the scanning trajectory of the light beam emitted from the light source.

Further, since the supporting portion for supporting the movable portion is made of a plate-like elastic body, there is no portion that generates friction when the movable portion swings, and excellent durability can be obtained. The movable section may be provided with a light source to directly emit a light beam, or as described in claim 2, by providing a reflecting surface for reflecting light emitted from an external light source,
The reflected light emitted from the reflecting surface may be used as a light beam.

It is desirable that the center of gravity of the movable part is located on the arrangement axis that is the center of the swinging movement of the movable part. In this case, even when the disturbance acceleration is applied, no moment is generated to change the vibration of the movable portion in the swing direction (also referred to as “first-order mode vibration”). Without being disturbed,
More stable scanning can be performed.

However, the center of gravity of the movable part and the arrangement axis do not necessarily have to be exactly coincident with each other, and a sufficient effect can be obtained if the center of gravity of the movable part is located near the arrangement axis. Next, as described in claim 4, the driving means has a resonance frequency determined from the mass of the movable part and the spring constant of the support part,
It is desirable to swing the movable part.

In this case, since the movable section resonates, the amplitude of the movable section can be maximized, and if the same amplitude is obtained, the power consumption of the driving means can be minimized. By the way, the driving means is constituted by a permanent magnet provided integrally with the movable portion and a solenoid disposed opposite to the permanent magnet, and applies an alternating current to the solenoid to generate an alternating magnetic field. The generation allows the movable portion to swing and drive.

The permanent magnet may be fixed to one of the two ends located in the swinging direction of the movable part, or the permanent magnet may be fixed to the movable part. It may be fixed to one of both ends along the moving direction. In the case of the former, for example, a permanent magnet is fixed so that both magnetic poles are arranged along a direction penetrating the reflection surface of the beam, and a solenoid is opposed to the middle of both magnetic poles of the permanent magnet,
The movable portion can be swung by alternately attracting and repelling both magnetic poles to the solenoid. In the latter case, for example, a permanent magnet is fixed so that both magnetic poles are arranged along the swing direction, and as in the former case, a solenoid is opposed to the middle between the two magnetic poles of the permanent magnet. The movable part can be swung by alternately attracting and repelling both magnetic poles to the solenoid.

In any of these cases, the driving means can have a simple structure, so that the apparatus can be downsized. Also, in order to facilitate the adjustment of the position of the center of gravity of the movable portion, an inertia body may be attached to the end of the permanent magnet opposite to the end where the permanent magnet is attached. Alternatively, an inertial body may be attached to both ends orthogonal to the attachment end of the permanent magnet.

In particular, when the permanent magnet is fixed to one end of the movable portion located in the horizontal direction, the inertial body having the same mass as the permanent magnet is placed on the side opposite to the end where the permanent magnet is mounted. By attaching to the end of the movable portion, the position of the center of gravity of the movable portion in the horizontal direction can be easily adjusted.

According to the tenth aspect of the present invention, when the permanent magnet or the inertial body is attached to the arm projecting from the movable part in a direction penetrating the beam emission surface, the position of the center of gravity of the movable part can be adjusted. Adjustment of the position of the center of gravity can be easily performed even when the center of gravity is greatly deviated in the direction penetrating the reflection surface.

According to the eleventh aspect of the present invention, in the plate-like elastic body constituting the supporting portion, the same number of the housing fixing pieces and the movable portion fixing pieces are formed, or only one of them is formed. It is desirable that the fixing pieces are alternately arranged. In this case, the rigidity of the support portion in directions other than the swing direction is further increased, and the movable portion can be more reliably prevented from vibrating in a direction other than the swing direction.

In the case where the plate-like elastic body has a slit formed between the housing fixing piece and the movable portion fixing piece as described in claim 12, as described in claim 13, the slit is formed as follows. It is preferable that the contour has a curved shape. In this case, when the plate-like elastic body is elastically deformed in accordance with the swing of the movable portion, stress generated particularly at the tip of the slit, that is, at the root of the fixed piece can be dispersed, and an impact load acts on the optical scanner. For example, when excessive deformation is applied to the fixing piece, it is possible to prevent the root portion of the fixing piece from being damaged.

Incidentally, the resonance frequency of the swinging motion of the movable portion is determined by the spring constant of the plate-like elastic body, and is further determined by the material and shape of the plate-like elastic body. In order to reduce the resonance frequency of the swinging operation in order to realize a slow operation, for example, a region where the plate-like elastic body is elastically deformed between the housing fixing piece and the movable portion fixing piece becomes long. It may be configured as follows. Specifically, the connecting portion between the housing fixing piece and the movable portion fixing piece may be formed in a wave shape as described in claim 14, or the housing fixing piece may be provided at one end as described in claim 15. A plate-shaped elastic body formed by elastically deforming the one in which the movable part fixed piece is formed at the other end into a shape in which the ridge part is arranged on the same axis may be used.
In these cases, the spring constant can be reduced without increasing the size of the support portion.

Further, the pair of plate-like elastic members constituting the support portion may be integrally connected at the base of the housing fixing piece or the movable portion fixing piece. In this case, the support part can be constituted by a single part,
Assembly and parts management can be facilitated.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 shows an optical scanner 1 according to a first embodiment.
FIG. 2 is an exploded view showing the overall configuration of FIG.

As shown in FIGS. 1 and 2, an optical scanner 1 according to the present embodiment has a housing 10 fixed to a housing or the like of an apparatus, and a movable section having a reflecting surface for reflecting incident light from a light source. 20; a support portion 30 for supporting the movable portion 20 so that the movable portion 20 can swing in a predetermined swing direction (Y-axis direction in the figure) with respect to the housing 10; And a drive unit 40 of

The housing 10 is made of an iron-made object, and is machined into a C-shape in plan view so as to have a pair of arms 10a and 10b formed so that their tips are close to each other. The movable section 20 includes a reflecting mirror 22 forming a reflecting surface, and is configured by fixing the reflecting mirror 22 to a movable section main body 26 fixed to the support section 30 via a spacer 24. And the movable part 20
A permanent magnet 42 is fixed to one end located in the swinging direction of, and an inertial body 50 having the same mass as the permanent magnet 42 is fixed to the other end.

The spacer 24 and the movable portion main body 26
Is an iron plate machined into a rectangular shape (thickness: 0.1 mm).
5 mm), and rectangular holes 24a and 26a are formed. In particular, in the movable portion main body 26, a notch 2 through which a later-described movable portion fixing piece is inserted is inserted through the hole 26a.
6b are provided continuously. The reflecting mirror 22 is made of a glass plate (about 0.2 mm in thickness), and aluminum is deposited on the surface thereof so that light can be reflected efficiently.

Next, the support portion 30 is composed of first and second springs (corresponding to plate-like elastic bodies) 32 and 34, and the folded portions formed at the tips are used for fixing to the housing 10. The housing fixing pieces 32a, 34a, and the movable part fixing pieces 32b, 34b provided on both sides of the housing fixing pieces 32a, 34a and having the folded portions formed at the ends used for fixing to the movable part 20 are provided.

The first and second springs 32, 34
The width in the Z-axis direction in the drawing is the notch 26b of the movable portion main body 26.
The width of the housing fixing pieces 32a, 34a in the Z-axis direction in the drawing is such that the spacers 24 and the movable portion main body 26 are formed when the springs 32, 34 are inserted into the cutout portions 26b. The holes 24a and 26a are formed so as not to come into contact with the edges of the holes 24a and 26a.

The first and second springs 32, 34
As shown in FIG. 3, stainless steel for spring
(Approximately 05 mm) into an E-shape by etching or punching, etc.
a, 34a and movable part fixed pieces 32b, 34b,
By performing bending at a bending position (indicated by a dashed line in the figure) of a predetermined length 1 from the distal end portions of these two fixed pieces,
A folded part is formed.

However, when the spring stainless steel is processed into an E-shape, the slit S formed between the fixing pieces is
The contour at the root portion P of the fixed portion is formed into a curved shape. Also, during the bending process to form the folded part,
The housing fixing pieces 32a and 34a are bent at an angle of 75 degrees, and the movable part fixing pieces 32b and 34b are bent at an angle of 60 degrees.

Here, the first and second springs 32 and 34 are made of stainless steel, but may be made of beryllium copper, phosphor bronze, spring steel, or the like. The first and second springs 32, 34 thus configured
Are combined so that the folded portions of the fixed pieces are folded in opposite directions. In this state, the folded portions of the movable portion fixed pieces 32b and 34b are arranged on the spacer mounting surface side of the movable portion main body 26. Is inserted through the notch 26b of the movable portion main body 26. Then, the movable part fixing piece 32
The first and second springs 3 b are welded to the spacer mounting surface of the movable portion main body 26 so that the first and second springs 3 b and 34 b are welded.
The support portion 30 composed of 2 and 34 is fixed to the movable portion main body 26. At this time, the two springs 32 and 34 are fixed so that the ridges formed by the bending process are arranged close to each other so as to contact each other.

As shown in FIG. 3, the movable section main body 26 to which the supporting section 30 is fixed is
2 and 34 are arranged so as to be housed between the two arm portions 10a and 10b of the housing 10, and the folded portions of the housing fixing pieces 32a and 34a of the springs 32 and 34 are replaced with the respective arm portions 10a and 10b of the housing 10. Weld to the tip of each.

As a result, the movable portion main body 26 is
0 and swingably connected to the housing 10. The arrangement axis i arranged so that the ridges of the springs 32 and 34 are in contact with each other becomes the center of rotation of the swinging motion of the movable section main body 26 (and thus the movable section 20).

Thereafter, the spacer 2 is attached to the movable portion main body 26.
4. The movable part 20 is assembled by fixing the reflecting mirror 22. At this time, the housing fixing pieces 32a, 32
The ridge line portion b is located on the same plane as the spacer mounting surface of the movable section main body 26. However, the housing fixing pieces 32a, 32
A hole 24a is formed in the spacer 24 so that b does not contact the spacer 24. That is, the movable section 20 can swing without receiving interference from other parts.

Further, the center of gravity of the movable portion 20 attached to the housing 10 via the support portion 30 is such that the permanent magnet 42 and the inertial body 50 attached to the movable portion 20
It is arranged so as to be located on the arrangement axis i which is the center of the zero swing motion. It should be noted that a screw hole is formed in the permanent magnet 42 or the inertial body 50, and by adjusting the screwing amount of a screw screwed into the screw hole, the position of the center of gravity of the movable portion 20 can be finely adjusted. Good.

Next, the drive section 40 includes a permanent magnet 42 attached to the movable section 20, a solenoid 44 arranged opposite to the permanent magnet 42, and an energization control circuit (not shown) for controlling the energization state of the solenoid 44. Consists of However, the permanent magnets 42 are arranged such that both magnetic poles are arranged in a direction (the X-axis direction in the figure) penetrating the beam reflecting surface of the movable section 20. Therefore, for example, the S pole is located on the beam reflecting surface side (hereinafter, referred to as “front side”), and the opposite side (hereinafter, “rear side”).
When the N pole is disposed on the permanent magnet 42 side of the solenoid 44, the S pole of the permanent magnet 42 on the front side of the movable portion 20 is attracted, and the N pole on the rear side is attracted.
Due to the repulsion of the poles, the movable portion 20 receives a moment that rotates clockwise in FIG.
When the S pole is generated on the side of the permanent magnet 42 of FIG. 4, the S pole of the permanent magnet 42 on the front side is repelled, and the N pole on the back side is attracted. It receives a moment that rotates counterclockwise.

For this reason, when the energization control circuit applies a periodic drive signal such as a sine wave or a rectangular wave to the solenoid 44 to generate an alternating magnetic field, the alternating magnetic field and the permanent magnet 4
The movable portion 20 swings around the arrangement axis i by the interaction with the second member 2. As a result, the light beam emitted to the reflecting surface formed by the reflecting mirror 22 changes its reflection direction linearly along the swinging direction (Y-axis direction) of the movable unit 20, so that the light beam is reflected from this reflecting surface. By using light, it is possible to perform one-dimensional scanning along a plane orthogonal to the array axis i. Note that the scanning speed of the light beam is controlled by the oscillation cycle of the movable section 20, that is, the frequency of the drive signal, and the scanning range of the light beam is determined by the magnitude of the oscillation of the movable section 20, that is, the drive signal. Controlled by amplitude (voltage level).

However, in the present embodiment, the frequency of the drive signal generated by the energization control circuit is determined by the moment of inertia of the movable section 20 and the first and second springs 3 forming the support section 30.
The resonance frequency is set to match the resonance frequency determined from the spring constants of 2, 34, and the movable section 20 swings in a resonance state.

When an excessive drive signal is applied to the solenoid 44 and the amplitude of the swing of the movable section 20 becomes too large, the movable section main body 26 moves to the arm sections 10a, 1 of the housing 10.
0b, so that the swing of the movable portion 20 is restricted. As described above, in the optical scanner 1 according to the present embodiment, the support portion 30 that swingably supports the movable portion 20 includes the first and second springs 32 and 3 that are elastically deformed.
4, and the arrangement axis i of the ridge portion formed by bending both springs 32 and 34 is set to be the center of the swinging motion of the movable portion 20.

That is, the first and second springs 32, 3
Reference numeral 4 indicates that the rigidity of the movable portion 20 against deformation in the swinging direction is low, and the rigidity against deformation in other directions, particularly in the direction along the arrangement axis i, is high. In addition to this, in the optical scanner 1 of the present embodiment, the position of the center of gravity of the movable unit 20 is made substantially coincident with the array axis i serving as the rotation center of the oscillating motion of the movable unit 20, so that the optical scanner 1 has a disturbance acceleration. Even if it acts, a moment that disturbs the oscillation in the swing direction used for optical scanning of the movable unit 20 is not generated.

In other words, according to the optical scanner 1 of the present embodiment, the support section 30 is not only structured so as not to generate unnecessary vibration that disturbs the scanning trajectory, and is not required even if a disturbance acceleration acts. The position of the center of gravity of the movable part 20 is set so that a moment for exciting vibration is hardly generated. For this reason,
Even when the optical scanner 1 is applied to an in-vehicle device or the like in which various vibrations are applied from the outside, the scanning trajectory of the light beam based on the swing of the movable unit 20 is not disturbed, and stable scanning can be performed. .

Further, in the optical scanner 1 of the present embodiment, the movable portion 20 supported by the first and second springs 32 and 34 does not generate friction during operation, so that the movable portion 20 has excellent durability, and furthermore has the housing. 10 arms 10a, 10b
, Restricts excessive swinging motion of the movable part 20 and
0 (first and second springs 32, 34) is prevented from being deformed more than necessary, so that the reliability of the device can be improved.

The first and second springs 32, 34
By making the contour of the slit S formed into a curved shape, the stress of the root portion P of the fixed piece generated when each fixed piece is deformed can be dispersed, and an external impact load acts on the optical scanner 1. Even in this case, breakage of the springs 32 and 34 can be prevented.

Further, in the optical scanner 1 of the present embodiment, since the driving unit 40 having a simple configuration including the permanent magnet 42 and the solenoid 44 is used, the apparatus can be configured at a low cost. Are driven so as to be in a resonance state, and a large swing can be obtained with a small driving force, so that the power consumption in the driving unit 40 can be reduced. [Second Embodiment] Next, a second embodiment will be described.

The optical scanner 1a of the present embodiment differs from the optical scanner 1 of the first embodiment only in a part of the configuration. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted. The following description focuses on the differences between the configurations. That is, in the optical scanner 1a of this embodiment, as shown in FIG. 5, the upper and lower ends (both ends in the Z-axis direction in the figure) of the movable unit main body 26, the front-back direction (the X-axis direction in the figure) penetrating the beam reflecting surface. Are provided on the beam reflection surface side, and an inertial body 52 for adjusting the position of the center of gravity of the movable portion 20 in the front-rear direction is attached to each of the arms 28.

The position of the center of gravity of the movable portion 20 in the front-rear direction can be adjusted by the shape and mounting position of the permanent magnet 42 and the inertial body 50 provided at a position facing the permanent magnet 42. By attaching the inertial body 52 via the arm 28 as in the embodiment, even when the position of the center of gravity is largely deviated, it is possible to accurately adjust the inertia body 52 with a small mass.

In the present embodiment, the inertia body 52 is attached to the arm 28. However, a permanent magnet is attached to one arm 28, and the movable unit 20 is oscillated by a solenoid disposed opposite to the permanent magnet. May be configured. Further, in the present embodiment, the arm 28 protrudes toward the beam reflection surface, but may be configured to protrude to the opposite side depending on the position of the center of gravity. [Other Embodiments] In the above-described embodiment, the reflecting mirror 22 is attached to the movable portion 20 so that light emitted from the outside is reflected by the reflecting mirror 22 to perform optical scanning. A light source may be mounted on the movable unit 20 instead of the mirror 22, and the light beam from the light source may be used to directly perform optical scanning.

In the above embodiment, the first and second springs 32, 34 constituting the support portion 30 are formed in an E-shape. However, as shown in FIG. The shape of the connecting portion 36c between the movable portion 36a and the movable portion fixing piece 36b is formed in a wave shape, and the movable portion 2
The spring 36, which is configured so that a region elastically deformed between the fixed pieces 36a and 36b becomes longer at the time of the rocking movement of zero.
May be used.

In this case, the spring constant of the support portion 30 can be reduced, and the resonance frequency of the swing can be reduced. Therefore, when slow optical scanning is required, the configuration of the support portion 30 can be accommodated without increasing the size. be able to. FIG.
As shown in (a), one end of the housing fixing piece 38a,
Using a trapezoidal plate-like spring having a movable part fixing piece 38b formed at the other end, each fixing piece 38a, 38b is bent at a predetermined position indicated by a dashed line and a dotted line in the figure to form a folded portion. Further, as shown in FIG. 7B, the spring 38 may be formed by elastically deforming the ridges formed by the bending process so as to be arranged on the same axis.

Also in this case, the spring 36 described above is used.
As in the case of (1), both the fixed pieces 38a, 38
Since the region elastically deformed between b becomes long, the same effect as in the case where the spring 36 is used can be obtained. Further, in the above embodiment, the first and second springs 32, 34 constituting the support portion 30 are formed separately, but as shown in FIG. 8, the root sides of the fixing pieces of both springs are integrally formed. It may be configured to be connected. However, it is desirable that the portion connecting the two springs 32 and 34 be curved so that elastic deformation in the swinging direction is not hindered.

In this case, the number of parts constituting the support portion 30 can be reduced to one, and the management of the parts and the assembly of the apparatus can be facilitated.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an overall configuration of an optical scanner according to a first embodiment.

FIG. 2 is an exploded view of the optical scanner according to the first embodiment.

FIG. 3 is an explanatory diagram illustrating a configuration of first and second springs.

FIG. 4 is a perspective view illustrating a state in which some components are removed in the optical scanner of the first embodiment in order to clarify a connection state of a support unit.

FIG. 5 is a perspective view illustrating an overall configuration of an optical scanner according to a second embodiment.

FIG. 6 is an explanatory view showing another embodiment of the first and second springs.

FIG. 7 is an explanatory diagram illustrating another embodiment of the first and second springs.

FIG. 8 is an explanatory diagram illustrating another embodiment of the first and second springs.

[Description of Signs] 1, 1a: Optical scanner 10: Housing 10
a, 10b: arm 20: movable part 22: reflector 24: spacer
26: movable part main body 28 ... arm 30 ... support part 32, 34, 36,
38 spring 32a, 34a, 36a, 38a housing fixing piece 32b, 34b, 36b, 38b movable part fixing piece 36c connecting part 40 driving part 42 permanent magnet 44 solenoid 50, 52 inertial body

Continued on the front page (72) Inventor Takeshi Matsui 1-1-1 Showa-cho, Kariya-shi, Aichi F-term in Denso Co., Ltd. (Reference) 2H045 AB03 AB06 AB10 AB38 5B072 AA02 CC24 DD02 JJ08 LL01 LL12 5J084 AA01 AB01 AC02 BA49 DA01 EA01 EA33

Claims (16)

[Claims] 1. A housing fixed to an attached body, a movable portion for emitting a light beam, a support portion for swingably supporting the movable portion with respect to the housing, and the movable portion being set in advance. A driving unit that swings in a swinging direction, and scans an object with a light beam emitted from the movable unit. The housing has a pair of arms arranged adjacent to each other. The support portion includes a housing fixing piece having a folded portion formed at the tip thereof fixed to one of the ends of the pair of arms, and a folded portion formed at the tip fixed to the movable portion. A movable portion fixed piece, and a ridge line portion formed on the housing fixed piece and the movable portion fixed piece by providing the folded portion comprises a pair of plate-like elastic bodies arranged on a single axis, The pair of plate-like elastic bodies is provided with the ridge line. Optical scanner but that are disposed between the pair of arms in close proximity to each other, the movable part is characterized by swinging movement about the array axis ridge portion is arranged between both the plate-like elastic bodies. 2. The apparatus according to claim 1, wherein the movable portion has a reflecting surface for reflecting light emitted from an external light source, and uses reflected light emitted from the reflecting surface as the light beam. An optical scanner as described. 3. The optical scanner according to claim 1, wherein a center of gravity of the movable section is located on the arrangement axis. 4. The movable unit according to claim 1, wherein the driving unit swings the movable unit at a resonance frequency determined from a mass of the movable unit and a spring constant of a support unit. Optical scanner according to the above. 5. The driving unit includes: a permanent magnet provided integrally with the movable portion; and a solenoid disposed to face the permanent magnet, and generates an alternating magnetic field in the solenoid, and The optical scanner according to any one of claims 1 to 4, wherein the movable portion is driven to swing by suction and repulsion. 6. The optical scanner according to claim 5, wherein the permanent magnet is fixed to one of both ends of the movable portion that is located in a swing direction. 7. The optical scanner according to claim 5, wherein the permanent magnet is fixed to one of both ends of the movable portion along a swing direction. 8. An inertial body for adjusting a position of a center of gravity of the movable portion is fixed to an end of the movable portion opposite to a mounting end of the permanent magnet. Item 5
An optical scanner according to claim 7. 9. An inertial body for adjusting the position of the center of gravity of the movable part is fixed to both ends of the movable part orthogonal to the mounting end of the permanent magnet. 8. The optical scanner according to 8. 10. The light according to claim 8, wherein the permanent magnet and the inertial body are attached to an arm protruding from the movable portion in a direction penetrating a beam radiation surface. Scanner. 11. The plate-like elastic body is characterized in that the number of the housing fixing pieces and the number of the movable section fixing pieces are equal to each other, or one of them is increased by one, and both fixing pieces are alternately arranged. The optical scanner according to any one of claims 1 to 10, wherein 12. The optical scanner according to claim 1, wherein the plate-like elastic body has a slit formed between the housing fixing piece and the movable part fixing piece. . 13. The optical scanner according to claim 12, wherein an outline of the slit has a curved shape. 14. The plate-like elastic body according to claim 1, wherein a connecting portion between the housing fixing piece and the movable portion fixing piece is formed in a wavy shape. Optical scanner. 15. The plate-like elastic body is formed by elastically deforming the one having the housing fixing piece at one end and the movable part fixing piece at the other end into a shape in which the ridge portion is arranged on the same axis. The optical scanner according to claim 1, wherein: 16. The apparatus according to claim 1, wherein said pair of plate-like elastic bodies are integrally connected at a root side of said housing fixing piece and said movable section fixing piece.
The optical scanner according to any of the above.