JP2001242596A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film unit with a lens in which the diaphragm size the focal position of a photographing lens are simultaneously changed by simple operation. SOLUTION: A diaphragm changeover plate 50 is moved between an insertion position at which a small diaphragm aperture 60 is inserted onto an optical axis and a withdrawal position at which the small diaphragm aperture 60 is withdrawn from the optical axis by the operation of a far-and-near changeover member 16. The hook 75 of a lens holder 71 is engaged with the notched part 61 of the diaphragm changeover plate 50, and the lens holder 71 is turned by linking with the movement of the diaphragm changeover plate 50. The lens holder 71 housing the photographing lens 12 is moved in an optical axis direction simultaneously with turning by the engagement of cam pins 74a-74c with cam grooves 73a-73c. A photographer switches the position and the diaphragm size of the photographing lens only by the operation of the far-and-near changeover member 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a film unit with a lens, and more particularly to a mechanism for switching a focal position.

[0002]

2. Description of the Related Art A film unit with a lens, in which a photographic lens and a shutter mechanism are incorporated and a photographic film is pre-loaded, is manufactured and sold by the present applicant, so that a photographer can easily enjoy photographing. The exposure value of this film unit with a lens is fixed from the viewpoint of reducing the manufacturing cost, and the photographing conditions cannot be changed according to the distance to the subject. For this reason, the aperture diameter is reduced so that the F number of the photographing lens is F9 or more, and a design is made such that a certain level of image quality can be secured over a distance from around 1 m to infinity.

[0003] However, if the aperture diameter is reduced so as to be able to cope with long-distance photography, pan-focus photography is performed even at short-distance photography, so that it is not possible to perform photography in which the subject to be photographed is emphasized. . Therefore, in order to bring the image quality level closer to that of a general camera even at the time of close-up shooting, it has been studied to incorporate a mechanism for changing the aperture diameter and the focal position of the shooting lens.

[0004]

The film unit with a lens is characterized by its low cost and its simple use. Therefore, if the required mechanism becomes complicated, it is not preferable not only in terms of cost but also in terms of operability, and a mechanism as simple as possible is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a lens-equipped film unit capable of simultaneously changing the aperture diameter and the focal position of a photographing lens with a simple operation.

[0006]

According to a first aspect of the present invention, there is provided a film unit with a lens, comprising: a photographing lens movable in an optical axis direction; A photographing lens moving means for moving the photographing lens between a first position and a second position closer to the subject than the first position; and a diaphragm diameter control means for changing the diaphragm diameter of the photographing lens. The lens moving means and the aperture diameter control means are interlocked with each other.

According to a second aspect of the present invention, in the film unit with a lens, when the taking lens is at the first position, the aperture diameter is small, and when the taking lens is at the second position, the aperture diameter is large. It is a feature.

According to a third aspect of the present invention, in the film unit with a lens, the photographing lens moving means includes a lens barrel having a cam groove formed therein, a lens holder having a photographing lens incorporated therein and having a cam pin engaged with the cam groove. The photographing lens is moved in the direction of the optical axis by moving the lens holder along the cam groove in conjunction with the operation of the aperture diameter control means.

According to a fourth aspect of the present invention, in the film unit with a lens, the diaphragm diameter control means is provided with a small diaphragm opening having a diameter smaller than the fixed open diaphragm opening, and an insertion position at which the small diaphragm opening is inserted on the optical axis. A movable diaphragm plate between a retracted position where the small diaphragm opening retracts from the optical axis, and a switching member for moving the diaphragm plate to the insertion position or the retracted position, and photographing when the diaphragm plate is at the inserted position. When the lens is at the first position and the aperture plate is at the retracted position, the photographing lens is at the second position.

According to a fifth aspect of the present invention, in the film unit with a lens, the diaphragm plate is held at the insertion position or the retracted position by the bias of a spring. In the film unit with the lens according to the sixth aspect, when the built-in flash is operated, the aperture plate is held at the retracted position.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a film unit with a lens according to the present invention will be described. As shown in FIG.
The film unit with a lens includes a unit body 10,
The label 1 wound around the outer periphery of the unit body 10
It consists of 1. A photographing lens 12, a finder 13, a strobe light emitting unit 14, a strobe switching knob 15, and a perspective switching member 16 are provided on the front of the unit body 10, and a shutter button 17, a film counter 18, a charging completion confirmation window 20 Is provided. A winding knob 21 is provided on the back of the unit body 10, and a part of the knob 21 is exposed to the outside.

As shown in FIG. 2, the unit body 10 comprises:
Main body base 22, exposure unit 23, strobe unit 2
4, a cartridge body 25, a photo film 26, a front cover 27 and a rear cover 30. The main body base 22 includes a dark box 31 that guides subject light that has entered the inside of the unit main body 10 to the photographic film 26, a cartridge storage chamber 32 that stores the cartridge main body 25, and is drawn out of the cartridge storage chamber 32 and formed into a roll shape. It comprises a photo film storage room 33 for storing the rolled photo film 26.

A finder 13, a shutter button 17, a winding knob 21, a shutter mechanism, a film unwinding mechanism, and the like are assembled to the main body base 22. The take-up knob 21 is engaged with a spool of the cartridge main body 25, and the photographic film 26 is fed by rotating the take-up knob 21. When the photo film 26 is wound up by exactly one frame, the shutter mechanism is charged, and the film unwinding mechanism operates to lock the rotation of the winding knob 21.

The exposure unit 23 includes a shutter blade 34,
It is composed of a shutter cover 35. Shutter blade 34
Is provided on the front surface of the dark box 31 so as to block the optical axis, and is attached to the main body base 22 via a spring 36. When the shutter mechanism operates, the shutter blades 34 are kicked off and retreat from the optical axis, and the springs 36 are biased to return the shutter blades 34 to their original positions. By this series of operations, the unexposed photographic film 26 is exposed. The shutter cover 35 holds the photographing lens 12 and is attached to the main body base 22 to cover the shutter blades 34.

The strobe unit 24 is provided beside the dark box 31, and includes a strobe light emitting section 14, a printed circuit board 37, a capacitor 38, and a synchro switch 40.
Further, a battery 41 is attached to a lower portion of the strobe unit 24 and is used as a power source for operating the strobe unit 24. On the printed circuit board 37, a strobe circuit for controlling charging and light emission of the strobe is formed. As a switch for operating the strobe circuit,
A switch piece 42 and a conduction portion 43 are provided. When the switch piece 42 is not in contact with the conducting section 43, the strobe circuit is not operating. However, when the switch piece 42 is depressed and comes into contact with the conducting section 43, the current from the battery 41 to the strobe circuit is started. The circuit works.

The strobe switching knob 15 is provided so as to be freely slidable in the vertical direction in the drawing so that the strobe light emitting section 14 can be freely switched between light emission and non-light emission. The sliding position corresponds to a lower end position (hereinafter, referred to as an off position) or an upper end position (hereinafter, referred to as an on position) in the figure.
Street locations are provided. Further, a projection (not shown) is provided on the back surface of the flash switching knob 15, and the projection and the switch piece 42 are arranged to be in contact with each other when the flash switching knob 15 is in the ON position. .

When the strobe switching knob 15 is in the ON position, the switch piece 42 is pushed down, and the switch piece 42 and the conducting portion 43 come into contact with each other to operate the strobe circuit. On the other hand, when the strobe switching knob 15 is at the off position, the protrusion and the switch piece 42 are separated from each other,
Since the switch piece 42 is not pushed down, the strobe circuit does not operate. Therefore, the start and stop of strobe charging can be freely switched by sliding the strobe switching knob 15.

Strobe charging is performed by charging a capacitor 38 from a battery 41. By the booster circuit attached to the printed circuit board 37, 3
A high voltage of about 00 V is applied to accumulate a sufficient amount of electric charge to cause the strobe light emitting section 14 to emit light. When the charging of the capacitor 38 is completed, the light emitting diode provided in the charging completion confirmation window 20 blinks, and the photographer detects the completion of the flash charging.

The synchro switch 40 is mounted on the printed circuit board 37 so as to interlock with the shutter mechanism. When the shutter button 17 is pressed down, the shutter mechanism is activated, and at the same time, the synchro switch 40 is closed, and a trigger signal for discharging the capacitor 38 is generated. The strobe light emitting section 14 has a built-in strobe discharge tube, and emits light by discharging from the capacitor 38.

The front cover 27 is attached to the front surface of the main body base 22, and a front panel 44 is provided on the front surface. The front panel 44 includes a perspective switching member 16.
, The opening 45 exposing the photographing lens 12,
An opening exposing the finder 13 is formed. An opening 46 exposing the strobe switching knob 15 is provided on a portion of the front cover 27 that is not covered by the front panel,
An opening exposing the strobe light emitting section 14 is formed.
An opening that exposes the shutter button 17 is formed on the upper surface of the front cover 27.

The rear cover 30 is provided behind the main body base 22, and covers the inside of the unit main body 10 together with the front cover 27 in a light-tight manner. The bottom cover 47a, 47
b are integrally formed and light-tightly cover the cartridge body 25 and the bottom of the photographic film 26. Also, the bottom cover 47
a is opened when the photographed cartridge body 25 is taken out.

As shown in FIG. 3, an aperture switching plate 50 and a spring 51 are provided between the front cover 27 and the front panel 44, and constitute an aperture diameter control mechanism together with the front cover 27 and the front panel 44. I do. Guides 53a and 53b for holding the aperture switching plate 50 are provided above and below the opening 52 formed in the center of the front cover 27.
An opening exposing the finder 13 to the outside, a shaft 54 for holding the spring 51 and a projection 55 are provided above the guide projection 53a. Also, on the side surface of the opening 46,
Notches 56a, 5b for fixing the strobe switching knob 15 to either the off position or the on position
6b are formed.

An oval opening 57 is formed at the center of the aperture switching plate 50, and an aperture plate 58 is provided so as to cover a part of the opening 57. At the center of the diaphragm plate 58, a small diaphragm opening 60 having a smaller diameter than the fixed diaphragm opening 52 is formed. A perspective switching member 16 is integrally provided below the aperture switching plate 50.
The perspective switching member 16 is connected to the opening 4 of the front panel 44.
5 and is housed in a recess formed in the center of the guide projection 53b, and is movable in the left-right direction in the figure. Accordingly, the aperture switching plate 50 is movable between an insertion position where the small aperture opening 60 is inserted on the optical axis and a retracted position where the small aperture opening 60 is retracted from the optical axis. The aperture can be switched by moving the perspective switching member 16. Reference numeral 63 denotes a notch formed below the aperture switching plate 50, which is used as a part of a photographic lens moving mechanism described later.

The spring 51 is connected to the front cover 27 by a shaft 54.
One end thereof is engaged with the projection 55 of the front cover, and the other end is engaged with a projection 61 formed on the upper part of the aperture switching plate 50. Therefore, the aperture switching plate 50 and the front cover 27 are connected via the spring 51,
In the normal state, the aperture switching plate 50 is held at the retracted position. When the photographer moves the perspective switching member 16 against the bias of the spring 51, the aperture switching plate 50 moves to the insertion position. Reference numeral 62 denotes a projection provided in the opening 45 of the front panel 44 so as to engage with the perspective switching member 16 when the aperture switching plate 50 is at the insertion position. Aperture switching plate 50
In the insertion position.

An aperture switching portion 15a is formed on one side of the strobe switching knob 15, and a triangular projection 15b is provided at the tip thereof. The aperture switching unit 15a is provided with an opening 64 formed in the front cover.
Through the front cover 27 and the front panel 44. Further, by engaging a projection (not shown) with the notches 56a and 56b formed on the front cover 27, the strobe switching knob 15 is fixed at either the off position or the on position.

When the flash switching knob 15 is moved to the on position when the aperture switching plate 50 is at the insertion position, the projection 15b of the flash switching knob 15 and one end of the aperture switching plate 50 come into contact, and the aperture switching plate 5
A force is applied to 0 in a direction to return to the retreat position. For this reason,
The engagement between the perspective switching member 16 and the projection 62 of the front panel 44 is released, and the aperture switching plate 50 is returned to the retracted position by the bias of the spring 51. Therefore, the aperture switching plate 50 can be in either the retracted position or the inserted position when flash photography is not performed, but is always set to the retracted position when flash photography is performed.

A lens barrel 70 is attached to the shutter cover 35, and a lens holder 71, a photographing lens 12,
Together with the lens holder 72 and the aperture switching plate 50, a photographic lens moving mechanism is configured. The photographing lens 1 is provided on the lens barrel 70.
Cam grooves 73a and 73 for moving the second in the optical axis direction.
b, 73c are formed.

On the outer periphery of the lens holder 71, cam pins 74a, 74b, 74c are provided. The taking lens 12 is housed inside the lens holder 71.
The outer peripheral portion of the front surface of the photographing lens 12 is pressed by a lens holder 72, and the photographing lens 12 is sandwiched and held by the lens holder 71 and the lens holder 72. At the center of the lens holder 71, a fixed stop opening 71a larger than the small stop opening 60 is formed, and subject light from the taking lens 12 passes through the fixed stop opening 71a and is guided into the unit. .

The cam pins 74a to 74c are provided in the cam grooves 73a.
73c, and is movable along the cam grooves 73a to 73c. The cam pin 74b is connected to another cam pin 7b.
4a, 74c, and a hook 75 is provided at the tip thereof. The hook 75 is engaged with the notch 63 of the aperture switching plate 50. When the aperture switching plate 50 moves from the retracted position to the inserted position, the hook 75 is interlocked, and the lens holder 71 can rotate counterclockwise in the drawing.

As shown in the development of FIG. 4, the cam groove 73a
73c are formed between a near position protruding toward the subject and a far position deepest in the lens barrel 70. The rotation direction in the figure corresponds to the counterclockwise direction in FIG. Therefore, when the lens holder 71 rotates counterclockwise, it moves from the near position to the far position.

Therefore, when the aperture switching plate 50 is at the retracted position, the taking lens 12 is held at the close position. On the other hand, when the aperture switching plate 50 moves to the insertion position, the lens holder 71 rotates via the hook 75, and the photographing lens 12 moves to the far position. Further, when the flash switching knob 15 is at the ON position, the aperture switching plate 50 is always at the retracted position, so that the photographing lens 12 is always held at the close position.

The operation of the present invention will be described below. When photographing an object on the short distance side, such as when photographing a person, the photographer uses the distance switching member 16 to switch the aperture switching plate 5.
Set 0 to the retracted position. At this time, as shown in FIG. 5, the small-aperture opening 60 is retracted from the optical axis and is exposed only through the fixed-aperture opening 71a, so that the F-number decreases. Further, as shown in FIG. 6, the photographing lens 12 is extended toward the subject, so that the subject on the short distance side is in focus. Therefore, the imaging power of the subject on the short distance side is improved.

On the other hand, when photographing a long-distance object such as landscape photography, the photographer uses the perspective switching member 16 to set the aperture switching plate 50 to the insertion position. At this time, as shown in FIG. 7, since the small stop aperture 60 is inserted on the optical axis, the stop diameter of the photographing lens decreases, and the F-number increases. Further, as shown in FIG. 8, the photographing lens 12 is retracted into the lens barrel 70, so that the object on the far side is in focus. Therefore, the descriptive power of the distant subject is improved. Further, since the depth of field becomes deeper as the aperture diameter becomes smaller, it is possible to maintain a certain level of image quality even for a subject on the short distance side.

In photographing that requires strobe light emission, such as at night, the photographer moves the strobe switching knob 15 to the ON position. Then, since the aperture switching plate 50 is always held at the retracted position, the small aperture 60 is retracted from the optical axis. Accordingly, the aperture diameter increases, and the exposure amount increases, so that a sufficient exposure amount can be obtained even in nighttime photographing.

In the above embodiment, the taking lens 12 is moved by the movement of the aperture switching plate 50. However, a means for moving the taking lens 12 is provided outside, and the aperture switching plate 50 is moved by the movement of the taking lens. You can also

In the above embodiment, the aperture is switched by inserting and removing the aperture plate 58 having the small aperture 60 formed therein. However, a large aperture having a larger diameter than the small aperture 60 is connected to the aperture switching plate 50. It may be formed and switching between a large aperture and a small aperture may be performed. In the above embodiment, the steady position of the diaphragm switching plate 50 is set as the retreat position, but the steady position of the diaphragm switching plate 50 may be set as the insertion position.

In the above embodiment, the aperture switching plate 5 is linked with the movement of the strobe switching knob 15 to the ON position.
Although 0 is moved to the retreat position, the strobe switching knob 15 and the perspective switching member 16 may be provided so as to operate independently. In the above-described embodiment, the example in which the aperture switching plate 50 is moved against the bias of the spring 51 is used. However, the spring 51 may be omitted, and the switching between the insertion position and the retracted position may be manually performed. it can.

[0038]

As described above, according to the present invention, a structure for switching the aperture diameter and the focal position by using one operation member is provided, so that the photographing according to the distance to the subject can be performed by a simple operation. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a film unit with a lens.

FIG. 2 is an exploded perspective view showing the inside of the film unit with a lens.

FIG. 3 is an exploded perspective view showing the inside of a front cover of the film unit with a lens.

FIG. 4 is a development view of a cam groove provided in the lens barrel.

FIG. 5 is a schematic diagram showing a main part of an exposure control mechanism when an aperture switching plate is set at a retracted position.

FIG. 6 is a schematic diagram showing a cross section of a lens barrel when a diaphragm switching plate is set at a retracted position.

FIG. 7 is a schematic diagram showing a main part of an exposure control mechanism when an aperture switching plate is set at an insertion position.

FIG. 8 is a schematic view showing a cross section of a lens barrel when a diaphragm switching plate is set at an insertion position.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 unit main body 12 photographing lens 15 strobe switching knob 16 perspective switching member 50 aperture switching plate 51 spring 60 small aperture opening 70 lens barrel 71 lens holder 71a fixed aperture opening 73a, 73b, 73c cam groove 74a, 74b, 74c cam pin

Claims (6)

[Claims] An imaging lens movable in an optical axis direction, a first position where the imaging lens enters an image forming surface side, and a second position closer to a subject than the first position. A lens having a lens, wherein the lens comprises: a photographing lens moving unit for moving a photographing lens; and a diaphragm diameter control unit for changing a diaphragm diameter of the photographing lens, wherein the photographing lens moving unit and the diaphragm diameter control unit are interlocked with each other. Film unit. 2. The diaphragm diameter is small when the taking lens is at the first position, and is large when the photographing lens is at the second position.
The described film unit with lens. 3. The photographing lens moving means includes a lens barrel having a cam groove formed therein, and a lens holder having the photographing lens incorporated therein and having a cam pin engaged with the cam groove. By moving the lens holder along the cam groove in conjunction with the operation of the control means,
3. The film unit with a lens according to claim 1, wherein the photographing lens is moved in an optical axis direction. 4. The diaphragm diameter control means is provided with a small diaphragm opening having a smaller diameter than a fixed open diaphragm opening, and an insertion position at which the small diaphragm opening is inserted on an optical axis; A diaphragm plate movable between a retracted position retracted from the axis,
A switching member for moving the diaphragm plate to the insertion position or the retracted position; when the diaphragm plate is at the insertion position, the photographing lens is at the first position; and when the diaphragm plate is at the retracted position, The film unit with a lens according to claim 1, wherein the photographing lens is at the second position. 5. The lens-fitted film unit according to claim 4, wherein the aperture plate is normally held at the insertion position or the retracted position by a bias of a spring. 6. A film unit with a lens according to claim 4, wherein said aperture plate is held at said retracted position when a built-in flash is operated.