JPH05142027A - Vibration detection device - Google Patents

Abstract

(57) [Abstract] [Purpose] The control for setting the steady state (initial position) of the floating body is unnecessary, the sensitivity and accuracy of the device are improved, and the device starts up relatively quickly when the power is turned on. It becomes possible to do. [Structure] In order to positively utilize the unbalanced component of the weight of the floating body 2, the floating body is housed vertically in the housing 1 and stabilized in a state where components other than gravity are removed. The light guide portion 2a, the light emitting element 5, and the light receiving element 6 are respectively positioned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a shake detecting device arranged on a camera, binoculars or the like.

[0002]

2. Description of the Related Art As a shake detecting device for detecting shake, various methods have been proposed in the past, but they have a complicated mechanism and become relatively large. Other than that, it was not put to practical use.

Therefore, for example, as a practical one,
There is a displacement detection device called a hydrostatic sensor. This is a device that places an object in a floating state in a liquid that is hermetically filled in a container, etc. Due to the action and the inertial force of the object, the phenomenon that the object is held stationary at the initial position without moving at all is used. At this time, since the container or the like is displaced relative to the object, the absolute displacement amount of the container or the like can be detected by detecting the relative displacement between the container and the object. It is based on such a principle.

Conventionally, as such a hydrostatic sensor, there is one as shown in FIGS.

In FIG. 5 to FIG. 7, 101 is a base on which each component of the apparatus is mounted, and 102 is a floating body 10 inside.
3 and a transparent liquid 104 are enclosed in a cylindrical housing, and a U-shaped floating body holder 114, which is shown in detail in FIG. 5, is fitted and fixed to the housing 102. The groove portion 102a is formed on the inner peripheral wall surface thereof. 10
Reference numeral 3 denotes a floating body, which is rotatably held around the shaft 103a by the floating body holding body 114, and has a mirror 109 and a slit 110a covering the mirror 109 on both surfaces of a pair of side surfaces of the central block. 110 are attached, and arms 103b extend from the other pair of side surfaces of the central block. The floating body 103 is configured so that the rotation balance around the shaft 103a and the buoyancy balance in the liquid 104 are balanced.

Reference numeral 105 denotes a light emitting element (IRED) which generates light when energized, and is attached and fixed to the base 101 by a light emitting element holder 107. Reference numeral 106 denotes a light receiving element (PSD) which is a photoelectric conversion element whose output changes depending on the position of the received light, and is fixed to the base 101 by a photoelectric conversion element holder 108. The light emitting element 105 and the light receiving element 106 are attached to the surface of the central block of the floating body 103.
The optical angular displacement detecting means of the type that transmits light via 09 is configured. The light emitting element holder 107 is formed with a light guide portion 107a for guiding the light from the light emitting element 105, and the floating body 103 is provided at the tip of the light guide portion 107a.
The same slit 11 as the mask 110 that covers the Mira-109
A mask with 0a is attached. Since this optical transmission is performed through the housing 102, the entire housing 102 or the corresponding portion is made of a transparent material.

The floating body 103 described above is supported as follows.

That is, in the center block of the floating body 103, a rotating shaft 103a vertically penetrating as shown in the sectional view of FIG.
Are provided, and pivots 112 each having an outwardly sharp tip are press-fitted into the upper and lower ends thereof. On the other hand, pivot bearings 113 are provided at the tips of the U-shaped upper and lower arms of the above-mentioned floating body support 114 so as to face each other inwardly, and the sharp tips of the pivots 112 are the pivot bearings 1.
The floating body 103 is supported by being fitted into the floating body 103.

Reference numeral 115 denotes an upper lid of the housing 102, which is sealed to the housing 102 by a known technique using a silicon adhesive or the like.
It is glued. Reference numeral 116 denotes a rubber packing, which is sandwiched between the pressing plate 117 and the upper lid 115 and fixed to the upper lid with screws or the like.

Numerals 119 and 120 are yokes for forming a magnetic circuit, one end of which is a floating body 10 in order to stably fix the floating body 103 shown in the posture of FIG. 5 by a magnetic biasing force.
It is arranged so as to face the tip of the third arm 103b. Further, the yoke 1 is provided between the other ends of the yokes 119 and 120.
21 and a coil 123 are connected to each other, and when the coil 123 of the electromagnet is energized,
Yoke 121 → Yoke 119 → Floating body 103 → Yoke 12
A closed magnetic circuit of 0 → electromagnet → yoke 121 is formed.

In the above structure, the floating body 103 does not generate a rotational moment under the influence of gravity in any posture, and the pivot shaft 103a is prevented from being substantially loaded by a load as described above. It is configured such that the rotational balance around the and the buoyancy in the liquid 104 are balanced.

In such a structure, even if the casing 102 rotates around the rotation axis 103a, the inside of the liquid 104 does not move due to inertia, so that the floating body 103 in a floating state does not rotate. Therefore, the casing 102 and the floating body are not rotated. 103 is a rotating shaft 103a
Will rotate relative to. This is the principle of the present device for detecting the relative angular displacement, and the relative angular displacement generated between them is the light emitting element 105 and the light receiving element 10 described above.
6 can be detected by an optical detecting means.

Actually, a flow occurs inside the enclosed liquid due to the influence of the wall surface of the housing 102, and this exerts a force on the floating body 103. The influence is the distance from the wall surface to the floating body 103.
The liquid 104 can be made as small as possible by selecting it in consideration of the viscosity of the liquid 104 and the like.

Now, the detection of the angular displacement is performed as follows in the apparatus having the above-mentioned configuration.

First, the light emitted from the light emitting element 105 passes through the light guide portion 107a and is applied to the floating body 103, where it is reflected by the mirror 109 and reaches the light receiving element 106. Since the mask 110 is arranged on the tip of the light guide portion 107a and the mirror 109 of the floating body 103 as described above, the light is transmitted through the mask 1 when the light is transmitted.
The slits 110a of 10 form substantially parallel light, and an image without blur (slit image) is formed on the light receiving element 106.

Since the housing 102, the light emitting element 105, and the light receiving element 106 are all fixed on the base 101 and move together, the housing 102 and the floating body 103 are relatively moved. When a large angular displacement motion occurs, the slit image on the light receiving element 106 moves by an amount corresponding to the displacement. Therefore, the light receiving element 106, which is a photoelectric conversion element whose output changes depending on the position of the received light.
Is an output proportional to the positional displacement of the slit image, and the angular displacement of the housing 102 and the base 101 can be detected by the output.

By the way, considering the angular displacement detecting device configured as described above, the posture of the floating body 103 cannot be regulated because the floating body 103 is not receiving a force from the outside. Then, there is no guarantee that the slit image is positioned within the measurement range of the light receiving element 106.

Therefore, for example, a method of exerting a weak magnetic field action on the floating body 103 by using a permanent magnet or an electromagnet and keeping the floating body 103 in the steady state position shown in FIG. 5 can be considered. That is, a current is passed through the coil 123 to operate it as an electromagnet, and this magnetic field action causes the yoke 121 → the yoke 119 → the floating body 103 → the yoke 120.
→ Form the closed magnetic circuit of the yoke 121, and
Hold 3 in place. Due to this magnetic field action, the floating body 1
In principle, the urging force exerted on 03 is a force that maintains the floating body 103 in a fixed posture with respect to the housing 102 (that is, moves integrally). Causes the problem that relative displacement due to the intended angular displacement does not occur, but if the magnetic field action is sufficiently small with respect to the inertia of the liquid, it seems to respond even at a relatively low frequency. Can be configured to.

[0019]

In the hydrostatic sensor described above, the mirror 109 is used as a part of the light guide to detect the shake, and the mirror 109 is used.
I used permanent magnets and electromagnets to get the initial position. Although these have a relatively simple structure,
In order to stably hold the mirror 109 in the liquid 104 at the initial position, it is necessary to maintain a good weight balance so that the mirror 109 does not deviate from the initial position due to an imbalance in weight. It was necessary to increase the magnetic force to some extent.

In addition, since the hydrostatic sensor requires a relatively long time to make the floating body 103 stand still at a fixed position, it takes a long time to start the detection, or the magnetic force is applied to set the initial position of the floating body. Since it is necessary to increase the strength to some extent, there has been a problem that sensitivity and accuracy with respect to low-frequency vibrations are slightly deteriorated.

In the hydrostatic sensor, since the mirror 109 is out of the effective measurement range in the steady state due to the weight imbalance, it is moved to the initial position. However, this is a force that is constantly being applied, and the adjustment must be performed for each individual, and ideally it is desirable to remove it.

In view of the above points, an object of the present invention is to eliminate the control for setting the steady state (initial position) of the floating body, improve the sensitivity and accuracy of the apparatus, and to turn the apparatus on when the power is turned on. It is an object of the present invention to provide a shake detection device that can relatively quickly rise.

[0023]

SUMMARY OF THE INVENTION According to the present invention, a floating body is accommodated in a housing in a state of being balanced with gravity by a non-uniform component of the weight of the floating body which cannot be removed in manufacturing. The light emitting element and the light receiving element are arranged corresponding to the light guide section.

[0024]

In order to positively utilize the unbalanced component of the weight of the floating body, the floating body is vertically housed in the housing and stabilized with components other than gravity removed, and in this state, the light guide portion of the floating body, Each of the light emitting element and the light receiving element is positioned.

[0025]

1 and 2 are diagrams showing a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a housing which is wholly or partially light-transmissive. Reference numeral 2 denotes a floating body which is made of a material having a light-shielding property and soft magnetism, such as plastic mixed with iron powder or the like, and which is axially supported by a pivot bearing portion of a support frame 3 which will be described later. A slit portion 2a, a notch portion 2b serving as a stopper, and a blade portion 2c are formed. Reference numeral 3 is a support frame that supports the floating body 2 and is housed and fixed in the housing 1. Reference numeral 4 denotes a lid made of a material having a light-transmitting property in part or in whole like the housing 1, and the lid 4 fixes the liquid filled in the housing 1 in a liquid-tight state.

Reference numeral 5 is a light source such as an infrared light emitting diode for detecting the rotational position of the floating body installed near the lid 4. Reference numeral 6 denotes a light receiving element such as a PSD (semiconductor position detecting device) installed near the lower surface of the housing 1. Reference numeral 7 is an electromagnet, and by its magnetic action, for example, the operating frequency characteristic of the floating body 2 is standardized in order to improve the vibration at a low frequency, and the floating body 2 and the light emitting / receiving elements 5 and 6 are caused by the attitude difference of the device. It is used for controlling the sensor, such as correcting the change in relative position.

Here, the floating body 2 is supported by a support frame 3 so as to be freely rotatable in the vertical direction shown in FIG. 2 (the rotation axis is horizontal), and components other than gravity are positively utilized by positively utilizing the unbalanced component of weight. Stabilize with the removed. Then, in this state, the mounting positions of the light emitting / receiving elements 5 and 6 are set in accordance with the position of the slit 2a of the floating body 2.

As a result, the floating body 2 can be stopped at an appropriate position (detection range of the light emitting / receiving sensor) in a steady state without adding electrical or magnetic correction as in the conventional case.

More specifically, in order to maintain the relative position of the slit 2a of the floating body 2 and the light receiving element 6 in a steady state, conventionally, a magnetic force by a permanent magnet or an electromagnet is always provided between the floating body 2 and the housing 1. Although it was working, this was necessary, and it took a long time to make the floating body 2 stand still in the steady state, which was a problem in the past, so it took time to start detection. Therefore, since the magnetic force is constantly generated, the sensitivity and accuracy for low-frequency vibration are not deteriorated to some extent. Further, the adjustment of the magnetic force for setting the floating body 2 in the steady state is completely unnecessary.

Next, the actual operation of the angular displacement detecting device shown in FIG. 1 will be described step by step.

Here, it is assumed that this apparatus is fixed to a camera or the like, and the shake of the camera or the like is rotational shake about the axis of the floating body 2.

When the camera shakes, the posture of the floating body 2 is maintained as it is due to the liquid filled in the housing 1 and the inertia of the floating body 2, and the shaking of the housing 1, that is, the camera or the like is relatively caused. It can be detected by replacing it with the movement of the floating body 2. That is, the light from the light source 5 passes through the slit 2a of the floating body 2 and is projected in a slit shape on the light receiving element 6,
The movement of the floating body 2 becomes the movement of the slit light on the light receiving element 6 as it is, and by detecting the positional displacement of the slit light on the light receiving element 6, the shake of the camera or the like can be detected.

In this embodiment, the drive by the electromagnet 7 changes the frequency characteristic of the device due to its magnetic action, and the relative position of the floating body 2 and the light emitting / receiving elements 5 and 6 due to the attitude difference of the camera or the like. It is used when performing control operations such as correcting changes.

FIG. 3 is a perspective view showing a floating body according to the second embodiment of the present invention.

This embodiment is intended to obtain the same effect as that of the first embodiment by positively adding the weight imbalance component to the floating body 2. That is, as shown in FIG. 3, an appropriate hole 8 is formed in the floating body 2 so as not to affect the sensitivity and accuracy of the apparatus so that gravity is balanced at a specific position. Needless to say, in this case,
The place where the hole 8 is opened is on the top, and the balance is achieved.

FIG. 4 is a perspective view showing a floating body according to the third embodiment of the present invention.

Similar to the second embodiment described above, in this embodiment as well, an unbalanced component of weight is positively added to the floating body 2 to obtain the same effect as that of the first embodiment. Is. That is, as shown in FIG. 4, the floating body 2 is provided with an appropriate protrusion 9 that does not affect the sensitivity and accuracy of the apparatus, and balances with gravity at a specific position.
Needless to say, in this case, the place where the protrusion 9 is provided is on the lower side, and the balance can be achieved.

(Modification) In this embodiment, the floating body 2 is positively operated.
As an example of adding an unbalanced component of weight to the
A hole is formed in the hole or a protrusion is provided, but the present invention is not limited to this. For example, by adding a weight or mixing impurities with different specific gravities in a part, balance with gravity at a specific position. You may do it.

Further, the case where the light guide portion of the floating body 2 is the slit 2a has been described. However, a reflecting portion is provided in one direction of the floating body 2 instead of the slit, and the light source 5 and the light receiving element 6 are provided at a position facing the reflecting portion. May be arranged.

[0041]

As described above, according to the present invention,
In order to positively utilize the unbalanced component of the weight of the floating body, the floating body is vertically housed in the housing and stabilized with components other than gravity removed, and in this state, the light guide section of the floating body, the light emitting element, Each light receiving element is positioned. Therefore, it becomes possible to eliminate the control for setting the steady state (initial position) of the floating body, improve the sensitivity and accuracy of the device, and relatively quickly start up the device when the power is turned on.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of a shake detection apparatus according to a first embodiment of the present invention.

FIG. 2 is a view for explaining how to attach the floating body in FIG.

FIG. 3 is a perspective view showing a configuration of a floating body according to a second embodiment of the present invention.

FIG. 4 is a perspective view showing a structure of a floating body according to a second embodiment of the present invention.

FIG. 5 is a plan view of a main part of a conventional angular displacement detection device.

6 is a vertical cross-sectional view of the angular displacement detection device of FIG.

7 is an exploded perspective view of essential parts of the angular displacement detection device of FIG.

[Explanation of sign]

 1 Case 2 Floating Body 2a Slit 3 Support Frame 5 Light Source 6 Light-Receiving Element 7 Electromagnet 8 Hole 9 Protrusion

Claims (2)

[Claims] 1. A floating body that is rotatably supported and has a light guide, a housing that houses the floating body, a light emitting element that emits light toward the light guide of the floating body, and a light from the light guide of the floating body. In a shake detection device including a light receiving element that receives light and outputs a signal corresponding to a relative displacement between the floating body and the housing, the floating body is a non-uniform component of the weight of the floating body that cannot be removed in manufacturing. The shake detection apparatus is characterized in that the light-receiving element and the light-receiving element are accommodated in the housing in a state of being balanced with gravity by the above, and in this state, the light-emitting element and the light-receiving element are arranged in correspondence with the light guide portion of the floating body. 2. The non-uniform component of the weight of the floating body includes holes, weights,
The shake detection device according to claim 1, wherein the shake detection device is at least one of the protrusions.