JP2002062581A - Photographing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain stable quality with a simple constitution at low cost in a photographing apparatus which makes pinhole photographing possible with easy operations. SOLUTION: This device has a pinhole and is equipped with a switching member which can properly switch, by an external, a photographing state where the pinhole is moved to a photographing position where subject light passing through the pinhole exposes film and a non-photographing state where the pinhole is moved to a non-photographing position where the subject light passing through the pinhole does not expose the film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing apparatus for performing exposure using a pinhole.

[0002]

2. Description of the Related Art A pinhole camera, in which a pinhole, that is, a minute hole is provided in front of a dark box without using a lens, and an image is formed on a film surface by light passing through the pinhole, has been conventionally known. This is the same principle as that the light from the knot of the shutter is reflected on a shoji or the like with the outside view inverted. Since the light passing through the pinhole is very small, a long exposure is required.For this reason, for example, moving people or cars disappear when shooting a busy city scenery, You can take fantastic photos as if the city is unmanned.

In such a conventional pinhole camera, since the pinhole is normally open, a black tape may be attached to the front of the pinhole to shield light,
She was wearing a lens cap. When performing exposure, the black tape was peeled off, and the lens cap was removed.

[0004]

However, when a black tape is applied to the front surface of the pinhole, the adhesive force is reduced, so that the tape can be used over and over again, and when the lens cap is used, the lens cap is lost. Therefore, it was difficult to obtain stable quality with a conventional pinhole camera.

[0005] Further, it is conceivable to provide a valve mechanism for long-time exposure, but a complicated shutter mechanism is required, and there has been a problem that the number of parts increases and the cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to realize a photographing apparatus capable of performing pinhole photographing with a simple operation with a simple configuration, attaining stable quality and at low cost. And

[0007]

The above object is achieved by any of the following means.

A photographing state having a pinhole and moving the pinhole to a photographing position where the subject light passing through the pinhole exposes the film, and a photographing state in which the subject light passing through the pinhole exposes the film. A photographing apparatus comprising: a switching member that can be appropriately switched by an external operation between a non-imaging state in which the pinhole is moved to a non-imaging position.

[0009] A pinhole member having a pinhole for exposing the film through the light of the subject, a photographing position for opening the pinhole, and a non-photographing position for shielding the pinhole are provided so as to be movable. And a light shielding member that can be appropriately switched between the photographing position and the non-photographing position by an external operation.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments of a photographing apparatus having a pinhole according to the present invention will be described with reference to the drawings.

First, an embodiment of a photographing apparatus will be described with reference to FIGS. 1 is an external perspective view of the photographing apparatus in a photographing state, FIG. 2 is a perspective view in a non-photographing state using a rotating switching member, and FIG. 3 is a perspective view in a photographing state using a rotating switching member.

The photographing apparatus shown in FIG. 1 has no photographing lens, and instead has a pinhole 11a of the switching member 11 at the center of the front surface, and a pinhole 11a at the lower right of the front surface.
The operation unit 12a of the operation member 12 for moving the right side protrudes rightward. Further, an objective lens window 1 of the finder is arranged on the upper part of the front surface, a winding knob 2 projects on the rear surface, and an indexer window 3 is arranged on the upper surface.

When using the photographing apparatus, after winding the film by turning the winding knob 2, the composition is determined by looking through the finder, and the operation unit 12a is projected as shown in FIG. Then, the pinhole 11a is located at the center, and the subject light passes through the pinhole 11a to expose the film.
The exposure time depends on the size of the pinhole, the film sensitivity, and the external luminance, and requires several tens of seconds to several minutes.
When the predetermined exposure time has elapsed, the protruding operation unit 12a is pushed back, and the pinhole 11a
Is retracted, and the exposure to the film ends.

Next, referring to FIG. 2 and FIG.
The operation of 1 and the like will be described. In both figures, reference numeral 11 denotes a switching member having a pinhole 11a. And, it is rotatably supported by a support shaft 14 to a dark box 13 located behind. However, its rotation range is dark box 13
It is regulated by the more protruding stoppers 13b and 13c.

Reference numeral 12 denotes an operation member, which has an operation portion 12a which can be externally operated on the right side as described above, and is slid in the left-right direction while being guided by a guide member (not shown). An interlocking pin 12 b projects from the left end of the operation member 12, and the interlocking pin 1
2b penetrates the long hole 11b provided in the switching member 11. Therefore, the switching member 11 is moved by the sliding of the operation member 12.
Rotates.

A spring pin 1 is provided at the lower left of the dark box 13.
3d protrudes, and a tumbler spring 15 is attached to the spring hook pin 13d and the spring hook pin 11c provided on the left end of the switching member 11.
Is hanging. In FIG. 2, the tumbler spring 15
Urges the switching member 11 clockwise, but the switching member 11 is in a stopped state because the lower left end of the switching member 11 is in contact with the stopper 13b.

An opening 13a is provided on the front surface of the dark box 13. On the other hand, although a film (not shown) is located behind the dark box 13, assuming an optical axis that is incident at right angles substantially at the center of a shooting screen formed on the film, the center of the opening 13a is located at this optical axis. are doing.

In FIG. 2, the pinhole 11a is retracted from the opening 13a, and the opening 13a is shielded from light by the switching member 11.

As described above, the pinhole 11a is
The state of being retracted from the position a and moving to the non-photographing position is the non-photographing state in which photographing is not performed. When photographing is performed, the operation unit 12a is slid to the right to protrude as shown in FIG.
Then, the operating member 12 that slides to the right becomes the interlocking pin 12b.
Then, the switching member 11 is turned counterclockwise through the long hole 11b. At this time, the urging force of the tumbler spring 15 is strengthened by the rotation of the switching member 11 in the counterclockwise direction, so that the operation portion 12a slides against the urging force. When pivoted to approximately the center of the range,
The biasing direction of the tumbler spring 15 is reversed, and this time the tumbler spring 15 biases the switching member 11 counterclockwise.
Therefore, the switching member 11 continues to rotate counterclockwise by the urging force of the tumbler spring 15 even if the hand is released from the operation portion 12a, and the switching member 11 rotates by the lower right end contacting the stopper 13c. To stop.

At this time, as shown in FIG.
The center of a and the center of the pinhole 11a are located coaxially. Therefore, the subject light passes through the pinhole 11a and the opening 1
Expose the film through 3a. The state in which the center of the pinhole 11a moves to the shooting position that is coaxial with the center of the opening 13a is the shooting state in which shooting is performed.

After a predetermined exposure time has elapsed, the operation unit 1
2a is pushed back to the left, and the switching member 11 is rotated clockwise. At this time, the operation portion 12a is slid at first against the urging force of the tumbler spring 15, but when the switching member 11 is rotated to substantially the center of the rotation range, the urging direction of the tumbler spring 15 is changed. Is inverted and the tumbler spring 15
Urges the switching member 11 clockwise. Therefore, after this, the switching member 11 continues to rotate clockwise due to the urging force of the tumbler spring 15 even if the hand is released from the operation unit 12a,
When the lower left end contacts the stopper 13b, the switching member 11 stops rotating.

As described above, the pinhole photographing can be easily performed by operating the operation section 12a, and the trouble of using the conventional black tape or lens cap can be eliminated.

In the non-photographing state, the pinhole 1
Since 1a is not exposed to the outside, dust and the like do not adhere to the pinhole 11a.

In the above embodiment, the operating member is slid left and right, but the operating member may be slid up and down to rotate the switching member.

Although the switching member is rotated in the above embodiment, the switching member may be slid. This embodiment will be described with reference to FIG. FIG. 4 is a perspective view in a non-photographing state using a sliding switching member.

In FIG. 4, the switching member 21 has a pinhole 21a and is configured to be slidable in the left-right direction by a guide portion 23b provided in the dark box 23. An operation member 22 is provided with an interlocking pin 22b provided at the left end.
Through the hole provided at the right end of the. Therefore, the operating member 2
The switching member 11 also slides in the left-right direction by the sliding operation of 2 in the left-right direction.

An upper portion of the operation member 22 is provided with an elastic click portion 22c, which is engaged with the left end of the click plate 24. In addition, a stop portion 2 provided below the operation member 22
Stopper 2 provided on the main body (not shown) at the left of 2d
It is in contact with 5. Therefore, the operating member 22 does not slide further leftward, and the operating member 22 does not easily slide rightward due to the engagement between the click portion 22c and the click plate 24. Is positioned. At this time, the opening 23 formed in the dark box 23 is similar to the above.
With respect to a, the pinhole 21a is retracted to the left, and the opening 23a is shielded from light to be in a non-photographing state.

Next, when taking a picture, the operation member 22a is operated to slide the operation member 22 rightward. At this time,
When the operation member 22 is slightly slid, the click portion 22
c retracts downward with respect to the click plate 24, and thereafter can be slid smoothly. Then, the right end of the stop portion 22d comes into contact with a stopper 26 provided on the main body (not shown), and at the same time, the click portion 22c engages with the right end of the click plate 24, so that the operation member 22 and the like are stopped and positioned. At this time, the center of the opening 23a and the pinhole 21a
Is located on the same axis, and the subject light is
Then, a film (not shown) located behind the dark box 23 through the opening 23a is exposed.

After a predetermined exposure time has elapsed, the operation unit 2
The engagement between the click portion 22c and the click plate 24 may be released by pushing the 2a back slightly to the left to return to the state of FIG.

Although the switching member 21 and the operating member 22 described above are configured to slide in the left-right direction, they may be configured to slide in the vertical direction.

In the above embodiment, the pinhole is moved. However, the pinhole may be opened and closed by fixing the pinhole and moving a light shielding member that shields the pinhole. .

This example will be described with reference to FIG. FIG. 5 is a perspective view in a shooting state using a sliding light shielding member.

In FIG. 5, a pinhole member 31 having a pinhole 31a is fixed to a dark box 34, and the center of the pinhole member 31 is an opening 34a provided in the dark box 34.
Is located on the same axis as the center. An operation member 32 has a configuration similar to that of the operation member 22 described above, and a click portion 32c provided on an upper portion of the operation member 32 and a click plate 35 are engaged. Further, the left end of the stop 32d provided at the lower part of the operation member 32 contacts the stopper 36, and the right end of the stop 32d contacts the stopper 37.

Reference numeral 33 denotes a light shielding member, and an interlocking pin 32b provided at the left end of the sliding member 32 passes through a hole provided at the right end of the light shielding member 33. Therefore, the light-blocking member 33 also slides in the left-right direction by the sliding operation of the operation unit 32a in the left-right direction.

Thus, at the time of non-photographing, the operation part 32a is pressed leftward to operate the light blocking member 33 by the operation member 32.
Is slid leftward to shield the pinhole 31a from light. At the time of photographing, as shown in FIG. 5, the operation unit 32a is slid rightward to slide the light blocking member 33 rightward by the operation member 32, and the subject light passes through the pinhole 31a and the opening 34a.
The film disposed behind the dark box 34 is exposed.

The operating member may be slid in the up and down direction, and the light blocking member may be slid in the up and down direction. The light shielding member may be rotated like the switching member 11 shown in FIG.

FIG. 6 is a partial longitudinal sectional view of the photographing apparatus of FIG. 5, in which the light shielding member 33 is retracted. The subject light passes through the pinhole 31a and the opening 34a, and exposes the film F. At this time, the opening 34a is formed larger than the pinhole 31a, and the optical path to the film F is
It is formed in a size not to be broken by a.

In FIGS. 5 and 6, the light shielding member 33 is disposed behind the pinhole member 31 having the pinhole 31a, but the light shielding member may be disposed in front of the pinhole member. This configuration will be described with reference to a partial longitudinal sectional view of the photographing apparatus shown in FIG.

In FIG. 7, a pinhole member 41 having a pinhole 41a is fixed to a dark box 44, and the center of the pinhole 41a and the center of the opening 44a of the dark box 44 are located coaxially. The light blocking member 43 slides in front of the pinhole member 41 in the same manner as in FIG. 5 to open and close the pinhole 41a. Reference numeral 48 denotes a stopper for the light shielding member 43.

By arranging the light shielding member 43 in front of the pinhole member 41 as described above, the pinhole 41a is not exposed to the outside in the non-photographing state, so that dust and the like adhere to the pinhole 41a. Can be prevented.

Also in this case, the opening 44a is
1a, and has a size such that an optical path to the film F is not shaken by the opening 44a.

Here, regarding the manufacture of the pinhole, since the pinhole must be formed very small, it is difficult to resin-mold the member having the pinhole, and a metal plate such as a phosphor bronze plate is used. It is desirable to make a pinhole by etching. When etching is performed from both sides of the plate surface, the size of the pinhole can be easily controlled, and the processing time can be reduced.

The diameter of the pinhole is obtained by the following equation.

[0044]

(Equation 1)

Here, r is the radius of the pinhole, f is the length from the pinhole to the film surface, λ is the wavelength of light, and λ is desirably 440 to 590 nm.

As an example, when the distance from the pinhole to the film surface is 25 mm, the plate thickness is 0.1 mm.
It is desirable to make a pinhole with a hole diameter of 0.18 to 0.25 mm using a phosphor bronze plate of
It is more desirable to make a 3 mm pinhole.

When the metal plate having the pinholes processed in this way is mounted on a resin member as shown in FIGS. 4 and 7, there are mounting methods as shown in FIGS. 8 to 10. These will be described below. I do.

First, in FIG. 8, FIG. 8 (A) is a view before the pinhole member having the pinhole is mounted on the mounting member, and FIG. 8 (B) is the pinhole member having the pinhole is mounted on the mounting member. FIG. Reference numeral 51 denotes a pinhole member having a pinhole 51a, which has two notches 51b. This pinhole member 51 is
It is inserted into the depression 52b of the mounted member 52 having the opening 52a. Then, in the state shown in FIG. 8B, an adhesive is dropped on the two notches 51b, and the pinhole member 51 is bonded to the mounted member 52.

FIG. 9A also shows a state before the pinhole member having the pinhole is mounted on the member to be mounted, and FIG. 9B shows the pinhole member having the pinhole as the member to be mounted. It is a figure after mounting. Reference numeral 61 denotes a pinhole member having a pinhole 61a, which has three sharp projections 61b. This pinhole member 61 is
It is inserted into the depression 62b of the mounted member 62 having the opening 62a. Then, as shown in FIG. 9B, the three protrusions 61b are formed.
Is engaged with the side wall of the recess 62b, and the pinhole member 61 does not come off the mounted member 62 due to frictional force.

FIG. 10A also shows a state before the pinhole member having the pinhole is mounted on the member to be mounted, and FIG. 10B shows the pinhole member having the pinhole as the member to be mounted. It is a figure after mounting. Reference numeral 71 denotes a pinhole member having a pinhole 71a, which has two notches 71b. This pinhole member 71
To the recess 72b of the mounted member 72 having the opening 72a.
And two notches 71b are inserted into two protrusions 72c protruding from the recess 72b. After this,
By crimping the tips of the two projections 72c by heat or pressing force to plastically deform the projections 72c, the protrusions 72c are deformed as shown in FIG.
The pinhole member 71 is fixed to the mounted member 72 as shown in FIG.

[0051]

According to the photographing apparatus according to the first to ninth aspects, a photographing apparatus capable of performing pinhole photographing with a simple operation can be realized with a simple configuration, with a stable quality and at a low cost. Can be.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a photographing apparatus in a photographing state.

FIG. 2 is a perspective view in a non-photographing state using a rotating switching member.

FIG. 3 is a perspective view in a shooting state using a rotating switching member.

FIG. 4 is a perspective view in a non-photographing state using a sliding switching member.

FIG. 5 is a perspective view in a shooting state using a sliding light shielding member.

FIG. 6 is a partial longitudinal sectional view of the photographing apparatus.

FIG. 7 is a partial longitudinal sectional view of the photographing device.

FIG. 8 is a view showing a state in which a pinhole member is mounted by bonding.

FIG. 9 is a diagram illustrating a state in which a pinhole member is mounted by frictional force.

FIG. 10 is a diagram showing a state where a pinhole member is mounted by caulking.

[Explanation of symbols]

11, 21 switching members 11a, 21a, 31a, 41a, 51a, 61a, 7
1a Pinhole 12, 22, 32 Operating member 12a, 22a, 32a Operating section 13, 23, 34, 44 Dark box 13a, 23a, 34a, 44a Opening 15 Tumbler spring 22c, 32c Click section 24, 35 Click plate 31, 41 , 51, 61, 71 Pinhole member 33, 43 Light shielding member 52, 62, 72 Member to be mounted

Claims (9)

[Claims] 1. A photographing state having a pinhole, wherein the pinhole is moved to a photographing position at which subject light passing through the pinhole exposes the film, and subject light passing through the pinhole exposes the film. A photographing apparatus comprising: a switching member that can be appropriately switched by an external operation between a non-photographing state in which the pinhole is moved to a non-photographing position where no photographing is performed. 2. The photographing apparatus according to claim 1, wherein the switching member is movable to the photographing position and the non-photographing position by rotating or sliding. 3. The switching member according to claim 1, wherein the switching member is held at the photographing position and the non-photographing position.
Or the imaging device according to claim 2. 4. A pinhole member having a pinhole through which subject light passes to expose a film, a photographing position for opening the pinhole, and a non-photographing position for shielding the pinhole. And a light shielding member that is provided and that can be appropriately switched to the photographing position and the non-photographing position by an external operation. 5. The photographing apparatus according to claim 4, wherein the pinhole member is disposed on a film side with respect to the light blocking member. 6. The photographing apparatus according to claim 4, wherein the pinhole member is disposed on a subject side with respect to the light blocking member. 7. The photographing apparatus according to claim 4, wherein the light shielding member is switchable between the photographing position and the non-photographing position by rotating or sliding. 8. The image forming apparatus according to claim 4, wherein the light shielding member is self-held at the photographing position and the non-photographing position.
The imaging device according to any one of claims 7 to 7. 9. The photographing apparatus according to claim 1, wherein an opening provided in a dark box located between the pinhole and the film is larger than the pinhole. .