JPH08313974A - Finder visual field switching mechanism - Google Patents

Abstract

PURPOSE: To provide a finder visual field switching mechanism which is constituted so that the visual field of a finder can be switched according to three or more printing modes and which can be made compact. CONSTITUTION: The front surface of the finder 6 is provided with the visual field switching mechanism 1 consisting of two sheets of visual field regulation plates 7 and 8, springs 14 and 15 pressing the plates 7 and 8, a reset plate 9, a spring 16 pressing the plate 9, a lock lever 17 and a spring 18 pressing the lever 17. The plates 7 and 8 are provided with apertures 7b and 8b respectively corresponding to the panoramic mode and the L-size mode and the lower ends thereof are provided with projections 7c and 8c engaged with the lever 17. Besides, the left sides thereof are integrally provided with operation part 7a and 8a having a knob at the end part. The plate 9 is provided with an operation part 9a having a knob at the left end part thereof and a projection 9c engaged with the lever 17. The lever 17 is integrally provided with a lock part 17a and a reset part 17b engaged with the projections 7C, 8C and 9c and pivotally supported to a shaft 3a projectingly provided on a unit main body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finder visual field switching mechanism for changing the visual field range of a finder of a camera or a film unit with a lens.

[0002]

2. Description of the Related Art In recent years, in order to further enhance the appeal and enjoyment of printed photographs with a camera or a film unit with a lens to general users, printed photographs with different aspect ratios are provided depending on the type and size of the photographed subject. ing. As such a print photograph, a conventional standard size L size print (89 mm x 127
mm), a panoramic print (89 mm × 252 mm) having a doubled horizontal length, a high-definition print (89 mm × 158 mm) that approximates the aspect ratio in high-definition television broadcasting, etc. are generally known.

As a method of obtaining such print photographs having different aspect ratios, the exposure range for the photographic film is adjusted by a light-shielding plate or the like provided in the lens-fitted film unit during the course of taking one photographic film. Limited to the L size print exposure range (24 mm x 36 m
m), panorama print exposure range (13 mm x 36 m
m) and high-definition print exposure range (20 mm x
36 mm) is set, and a print photograph of each mode described above is obtained from a negative film having a different exposure range obtained thereby.

Further, at the time of photographing, all the frames are photographed in a single exposure range in which the exposure range is fixed, and at the same time, print data designating a print mode is recorded, and the print data is used as a basis for printing at a photo lab or the like. Then, a method of obtaining a print photograph of each mode by printing only a range corresponding to the exposure range of each photographing mode as described above is also considered.

On the other hand, as known from Japanese Patent Application Laid-Open No. 6-301157, there is proposed a photographic film cartridge in which the entire film is wound in the cartridge without the leader portion protruding from the cartridge. In such a photographic film cartridge, the high-definition print exposure range (30.2 mm x 16.7 mm) is used as a standard exposure size, and the L size print exposure range (23.4 mm x 16.7m
m), and a panorama print exposure range (30.2 mm × 9.5 mm) in which the standard exposure size is restricted in the vertical direction are set.

As described above, the camera or the lens-fitted film unit having the function of limiting the exposure range or designating the print range usually changes the field of view of the finder according to the range of each print mode. The accurate print range in each print mode
There are many things that the photographer can understand. As a method of changing the field of view of a finder of a camera or a film unit with a lens, for example, a field-of-view limiting plate in which the field of view of the finder is made to correspond to the maximum print mode and an opening having a size corresponding to other print modes is provided. There is known a method of switching to a view field range corresponding to each print mode by inserting and removing the.

[0007]

As described above, when the field-of-view range of the finder is switched by inserting and removing the field-of-view limiting plate in the finder, it is necessary to secure the retracting area of this field-limiting plate in the unit body. In particular, when it is possible to switch to a viewfinder field corresponding to three or more print modes, at least two openings are provided in the field limiting plate.
You need more than one kind.

However, in many cases, the camera and the lens-fitted film unit have an exposure light path directly below the finder, so that a space for retracting the field limiting plate is inevitably provided in the lateral direction of the unit body. As a result, when the viewfinder field is compatible with three or more print modes, a horizontally long field limiting plate having two or more apertures must be attached, which increases the width of the camera and the film unit with lens. It will be. In the lens-fitted photo film unit, which is characterized by its small size and light weight, this field limiting plate is a major obstacle to miniaturization.

The present invention has been made to solve the above problems, and the viewfinder field can be switched in correspondence with three or more print modes, and the viewfinder field can be miniaturized. It is intended to provide a switching mechanism.

[0010]

In order to achieve the above object, in the viewfinder field switching mechanism of the present invention, a locking position in the finder of a camera or a film unit with a lens, or a front locking position, and a position separated from this locking position. At least two independent field limiting plates each having an opening of a different size for limiting the field of view of the finder, and the field limiting plates at the locking position. A locking lever for locking is provided, and when one field-of-view limiting plate is moved to the locking position, the other field-of-view limiting that has already been locked at the locking position by the locking lever. The viewfinder field is characterized in that the plate is unlocked by the locking lever and moves to the retracted position, and the field limiting plate moved to the locking position is locked at the locking position by the locking lever. Switching mechanism

According to another aspect of the present invention, there are a locking position in a finder of a camera or a film unit with a lens, or a front locking position, an intermediate position where one end of the finder is covered with a certain width, and a retracted position completely displaced from the locking position. Can be moved between
A field-of-view limiting plate having an opening for limiting the vertical field of view of the finder, and in conjunction with this field-limiting plate, when the field-of-view limiting plate is in the intermediate position, the other end of the finder is covered by a certain width, thus Along with the limiting plate, the horizontal field of view of the finder is limited, and when the visual field limiting plate is in the locking position or the retracted position, an interlocking plate that completely retracts from the finder is provided.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As the embodiments of the present invention, a lens-fitted film unit equipped with the finder visual field switching mechanism of the present invention will be described below. 2 is an external perspective view of a lens-fitted film unit equipped with the finder visual field switching mechanism of the present invention, and FIG. 1 is an explanatory view of the finder visual field switching mechanism portion of FIG. The lens-fitted photo film unit 2 can select any one of three types of print modes, that is, a high-definition mode, a panoramic mode, and an L size mode, and record it as print data on a photo film.

The lens-fitted film unit 2 is roughly divided into a unit body 3 and an outer box 4 covering the unit body 3. The unit main body 3 includes a known photographing mechanism (not shown), a photographic film cartridge (not shown), a finder visual field switching mechanism 1 and a print mode recording device 20 which will be described later.

On the front surface of the unit main body 3, a taking lens 5, a finder 6, and an operation section 7 for selecting a print mode.
a, 8a, and 9a are exposed, and the number-of-images display panel 11 and the release button 12 are exposed on the upper surface. A winding knob 13 for winding the photographic film is exposed on the back surface of the unit body 3.

As shown in FIG. 1, the finder 6 is composed of an eyepiece lens 6a and an objective lens 6b, and the field of view thereof corresponds to the high vision mode. Then, on the front surface of the finder 6, two field limiting plates 7 and 8 are provided.
Further, there is provided a viewfinder field switching mechanism 1 including springs 14 and 15 for urging them, a reset plate 9, a spring 16 for urging the reset plate 9, a locking lever 17 and a spring 18 for urging the locking lever 17.

The field limiting plates 7 and 8 are provided with openings 7b and 8b respectively corresponding to the panorama mode and the L size mode on the right side, and projections 7c and 8c engaging with the locking lever 17 are provided at the lower ends thereof. It is provided. Further, on the left side, operating portions 7a and 8a having knobs at the ends are integrally provided. The reset plate 9 is integrally provided with an operating portion 9a having a knob at the left end, and a protrusion 9c engaging with the locking lever 17 is provided at the lower right end.

The field limiting plates 7 and 8 and the reset plate 9 are arranged in this order from the objective lens 6b side to the front side in the order of the field limiting plate 7, the field limiting plate 8 and the reset plate 9, as shown in FIG. As described above, each is mounted so as to be movable between the locking position L on the front surface of the objective lens 6b and the retracted position R deviated from the locking position L. Further, the field limiting plates 7 and 8 and the reset plate 9 are provided with springs 14 and 15,
16 urges each in the direction of the retracted position R.

The locking lever 17 includes protrusions 7c, 8c and 9c.
A locking portion 17a that engages with and a reset portion 17b are integrally provided, and are pivotally attached to a shaft 3a protruding from the unit body 3. Then, it is biased counterclockwise by the spring 18.

With such a configuration, for example, FIG.
As shown in (A), the field limiting plate 7 is set at the locking position L, and the field of view of the finder 6 is limited to the panorama mode by the opening 7b. Is operated to set the field limiting plate 8 to the locking position L, the projection 8c of the field limiting plate 8
And the engaging portion 17a of the engaging lever 17 come into contact with each other, and the engaging lever 17 rotates clockwise against the bias of the spring 18.

Then, the visual field limiting plate 7 at the locking position L
The engagement between the projection 7c and the locking portion 17a is released, and the field limiting plate 7 is returned to the retracted position R by the spring 14. Then, when the projection 8c of the view limiting plate 8 gets over the locking portion 17a,
The locking lever 17 is rotated counterclockwise by a spring 18,
This time, the projection 8c and the locking portion 17a are engaged with each other, and the visual field limiting plate 8 is set at the locking position L (see FIG. 3 (B)).

Further, as shown in FIG. 3B, the visual field limiting plate 8 is set at the locking position L, and the visual field of the finder 6 is limited to the L size mode by the opening 8b. When the operation part 9a is operated when the field of view of the finder 6 is returned to the original high-definition mode by operating the operation part 9a, the projection 9c of the reset plate 9 and the locking part 17a of the locking lever 17 come into contact with each other as shown in FIG. Touch and lock lever 1
7 rotates clockwise against the bias of the spring 18.

Then, the visual field limiting plate 8 at the locking position L
The engagement between the projection 8c and the locking portion 17a is released, and the field limiting plate 8 is returned to the retracted position R by the spring 15. Then, the projection 9c and the locking portion 17a are engaged with each other, and the reset plate 9 is set to the locking position L. As a result, there is nothing in the front of the finder 6 that limits the field of view, and the finder 6
The field of view corresponds to the original high-definition mode. Then, by setting the reset plate 9 to the locking position L, it is possible to visually recognize from the front surface of the unit body 3 that the operating portion 9a is moving to the right side, and the lens-fitted film unit 2 corresponds to the high-definition mode. It is possible for the photographer to easily confirm that the camera is in a state of being present.

When the visual field limiting plates 7 and 8 are set to the locking position L, the print mode recording device 20 shown in FIG.
Members 21a and 21b of the selection switch 21 that configure the
The upper right corner of each touches and presses. The print mode recording device 20 records the print data designating the print mode on the photo film built in the unit main body 3 by selecting the print mode by the operation members 21a and 21b. It is composed of light emitting diodes 22a and 22b, a power supply 23, a one-shot multivibrator 24, a main switch 25, and the like.

The light emitting diodes 22a and 22b emit light for a certain period of time to set the data recording area 3 below the photographing frames 30a of the photographic film 30 shown in FIG.
A rectangular mark is exposed at 0b. Main switch 25
Is closed (turned on) in conjunction with the release button 9 of the unit body 3. Further, the one-shot multivibrator 24 outputs a pulse having a constant width when the main switch 25 is turned on.

With this structure, when the field limiting plate 7 is set to the locking position L, the upper right end of the field limiting plate 7 presses the operating member 21a, and the selection switch 21 selects which of the light emitting diodes 22a and 22b. Print mode recording device 2
0 circuit. Then, when the release button 12 is pressed, the shutter mechanism of the lens-fitted film unit 2 operates and the main switch 25 is closed.
The one-shot multivibrator 24 generates a pulse having a constant width. Thereby, the light emitting diodes 22a, 22
5b emits light for a certain period of time, and as shown in FIG. 5A, the panorama print data 32, which is represented by exposing two rectangular marks, is recorded in the data recording area 30b of the photographic film 30.

When the visual field limiting plate 8 is set to the locking position L, the upper right end of the visual field limiting plate 8 is moved to the operating member 21.
b is pressed and the selection switch 21 turns on the light emitting diode 22a.
Since only the light emitting diode 22a is connected to the circuit, when the release button 9 is pressed, the shutter mechanism operates and only the light emitting diode 22a emits light for a certain period of time. Then, as shown in FIG. 5B, the data recording area 30b of the photographic film 30.
The L-size print data 33, which is represented by exposing one rectangular mark, is recorded in.

Further, when the reset plate 9 is set to the locking position L, the operation members 21a, 21 of the selection switch 21 are set.
Since neither b is pressed, the selection switch 21 does not connect the light emitting diodes 22a and 22b together to the circuit. Therefore, even if the release button 9 is pressed, as shown in FIG. 5C, no rectangular mark is exposed in the data recording area 30b of the photographic film 30. As a result, this photographed frame is designated for high definition printing.

The operation of the embodiment having the above configuration will be described. When taking a picture using the lens-fitted film unit 2 having the viewfinder field switching mechanism 1 according to the present invention, first, the winding knob 13 is rotated to set an unexposed frame. Then, the operation units 7a, 8a, 9a are operated according to the configuration of the subject and the like to set the desired print mode.

For example, when the reset plate 9 is set to the locking position L and the view of the finder 6 corresponds to the original high-definition mode, the operating portion 7a is moved to the right to set the panoramic mode. First, the projection 7c of the field limiting plate 7 and the locking portion 17a of the locking lever 17
, And the locking lever 17 is pushed down in the clockwise direction against the bias of the spring 18. Then, the engagement between the protrusion 9c of the reset plate 9 and the locking portion 17a, which were in the locking position L, is released, and the reset plate 9 is returned to the retracted position R by the spring 16.

When the operating portion 7a is further moved to the right,
The projection 7c of the visual field limiting plate 7 rides over the locking portion 17a, and the locking lever 17 is rotated counterclockwise by the spring 18.
Then, as shown in FIG. 3 (A), the projection 7c and the locking portion 17a.
Engage with each other, and the field limiting plate 8 is set to the locking position L. As a result, the field limiting plate 7 overlaps the front surface of the objective lens 6b, and the field of view of the finder 6 is the aperture 7 of the field limiting plate 7.
The field of view of the finder 6 is limited to the range of b and corresponds to the panorama mode.

At the same time, the upper right end of the field limiting plate 7 presses the operating member 21a, and the selection switch 21 causes both the light emitting diodes 22a and 22b to be in the print mode recording device 2.
It is switched to the position where it is connected to the 0 circuit. Then, the photographer looks into the viewfinder 6 limited to the field of view corresponding to the panorama mode by the field-of-view limiting plate 7, confirms whether the subject is within the range of the panorama mode, and then presses the release button 12.

When the release button 12 is pressed, the shutter mechanism of the lens-fitted film unit 2 is operated, the main switch 25 is closed, and the one-shot multivibrator 24 generates a pulse having a constant width. Since the selection switch 21 has been switched to a position where both the light emitting diodes 22a and 22b are connected to the circuit of the print mode recording device 20, the light emitting diodes 22a and 22b.
Both emit light for a certain period of time. As a result, the panorama print data 32, which is represented by exposing two rectangular marks, is recorded in the data recording area 30b of the photographic film 30 shown in FIG.

When the winding knob 13 is rotated again and the operating portion 8a is operated to set the visual field limiting plate 8 to the locking position L in order to select the L size mode, the visual field limiting plate 8 is selected. The projection 8c and the locking portion 17a of the locking lever 17 come into contact with each other, and the locking lever 17 rotates clockwise against the bias of the spring 18.

Then, the field limiting plate 7 which was in the locking position L
The engagement between the projection 7c and the locking portion 17a is released, and the field limiting plate 7 is returned to the retracted position R by the spring 14. When the field limiting plate 8 is further moved to the right and the projection 8c gets over the locking portion 17a, the locking lever 17 is rotated counterclockwise by the spring 18, and this time, as shown in FIG. 3B, this time. Protrusion 8
c and the locking portion 17a are engaged with each other, and the visual field limiting plate 8 is set at the locking position L. As a result, the field limiting plate 8 overlaps the front surface of the objective lens 6b, the field of view of the finder 6 is limited to the range of the opening 8b of the field limiting plate 8, and the field of view of the finder 6 corresponds to the L size mode.

At the same time, the upper right end of the field limiting plate 8 presses the operating member 21b, and the selection switch 21 is switched to a position where only the light emitting diode 22a is connected to the circuit of the print mode recording device 20. Then, the photographer looks through the viewfinder 6 limited to the field of view corresponding to the L size mode by the field of view limiting plate 8 and confirms whether the subject is within the range of the L size mode, and then the release button 1
Press 2.

When the release button 12 is pressed, the shutter mechanism of the lens-fitted film unit 2 is operated, the main switch 25 is closed, and the one-shot multivibrator 24 generates a pulse of a constant width. Since the selection switch 21 is switched to the position where only the light emitting diode 22a is connected to the circuit of the print mode recording device 20, only the light emitting diode 22a emits light for a predetermined time. As a result, the L size print data 33, which is represented by exposing one rectangular mark, is recorded in the data recording area 30b of the photographic film 30 shown in FIG.

Further, when the operation section 9a is operated to set the field of view of the finder 6 to the original high-definition mode,
When the operation portion 9a is moved to the right side, as shown in FIG.
Protrusion 9c of reset plate 9 and locking portion 17 of locking lever 17
When a is abutted, the locking lever 17 rotates clockwise against the bias of the spring 18.

Then, the field limiting plate 8 in the locking position L
The engagement between the projection 8c and the locking portion 17a is released, the field limiting plate 8 is returned to the retracted position R by the spring 15, the projection 9c and the locking portion 17a are engaged, and the reset plate 9 is locked. Position L
Is set to As a result, there is nothing in the front of the finder 6 that limits the field of view, and the field of view of the finder 6 corresponds to the original high-definition mode. Then, by setting the reset plate 9 to the locking position L, it is possible to visually recognize from the front surface of the unit body 3 that the operating portion 9a is moving to the right side, and the lens-fitted film unit 2 corresponds to the high-definition mode. It is possible for the photographer to easily confirm that the camera is in a state of being present.

Even if the reset plate 9 is set to the locking position L, the operation members 21a, 21 of the selection switch 21 are set.
Since neither b is pressed, the selection switch 21 does not connect the light emitting diodes 22a and 22b together to the circuit. Therefore, even if the release button 9 is pressed, as shown in FIG. 5C, no rectangular mark is exposed in the data recording area 30b of the photographic film 30. As a result, this photographed frame is designated for high definition printing.

The photographic film of the lens-fitted film unit 2 photographed in this manner is printed with high-definition size on photographic paper for print frames not exposed to print data on the lower side of each photograph frame, and the panorama print data is printed. Photographed frames exposed with 32 or L size print data 33 are printed on photographic paper in panoramic size and L size, respectively.

The photographer mistakenly operates the operation units 7a, 8a,
By moving 9a to the right at the same time, the field limiting plates 7 and 8
If both the reset plate 9 and the reset plate 9 have been set to the locking position R, the reset plate 9 shown in FIG. 2 is moved further to the reset position on the right side. As a result, the projection 9c of the reset plate 9 comes into contact with the reset portion 17b of the locking lever 17 and the locking lever 17 rotates clockwise, and the projections 7c and 8c of the field limiting plates 7 and 8 and the locking portion 17a. Is disengaged, and the visual field limiting plates 7 and 8 both return to the retracted position L.

Next, a second embodiment of the viewfinder visual field switching mechanism embodying the present invention will be described. FIG. 6 is an explanatory view of the finder visual field switching mechanism in the second embodiment. The finder visual field switching mechanism 41 includes a locking position L on the front surface of the finder 40 having a visual field corresponding to the high-definition mode.
A field-of-view limiting plate 42 that is movable between an intermediate position M that covers one end of the finder by a certain width, a retracted position R that is completely out of the locking position, and an L-shaped interlocking plate that is provided below the finder 40. It consists of 43.

The field-of-view limiting plate 42 is provided with an opening 42a corresponding to the panoramic mode in the upper part, and a knob 42b for operating the field-of-view limiting plate 42 is integrally provided in the lower left corner. The interlocking plate 43 is provided with a sliding groove 43a,
An engagement protrusion 42c provided on the back surface of the field-of-view limiting plate 42 is slidably fitted therein. The entire field limiting plate 42 is rotatably attached to a shaft 44 provided under the finder 40.

With such a configuration, when the field limiting plate 42 is located at the retracted position R, the viewfinder 40 is not blocked at all, so that the field of view of the viewfinder 40 corresponds to the original high vision mode.

Then, when the knob 42b is operated to move the visual field limiting plate 42 to the intermediate position M, the right side of the visual field limiting plate 42 covers the left side of the finder 40 by a predetermined width, and the sliding groove 43a and the engaging projection 42. By the engagement of
The interlocking plate 43 rotates counterclockwise in association with the movement of the, and the arm portion 42d of the field limiting plate 42 covers the right side of the finder 40 by a certain width. As a result, both sides of the viewfinder 40 are provided on the right side of the field limiting plate 42 and the arm 4 of the field limiting plate 42.
2d and each are covered by a certain width, the viewfinder 40 has a field of view of L
Corresponds to size mode.

Further, when the knob 42b is operated to move the field-of-view limiting plate 42 to the engagement position L on the front surface of the finder 40, the interlocking plate 43 is rotated in the clockwise direction in conjunction with the field-of-view limiting plate 42, and the finder 40 is moved. Withdraw from the front of 40. Since the view of the finder 40 is limited by the opening 42a, the view of the finder 40 corresponds to the panorama mode.

In the above-mentioned two embodiments, the field of view of the finder is switched to a field of view corresponding to each mode of panorama, L size, and high-definition, but of course, it corresponds to any print mode other than this. hand,
You may switch the field of view of the finder.

[0048]

As described above in detail, according to the viewfinder visual field switching mechanism of the present invention, the locking position in the finder of the camera or the lens-fitted film unit or on the front surface and the locking position deviated from this locking position. At least two or more independent visual field limiting plates that are movable between the retracted position and each have a different size opening for limiting the visual field of the viewfinder, and these visual field limiting plates are engaged at the locking position. A locking lever for stopping is provided, and when one field-of-view limiting plate is moved to the locking position, another field-of-view limiting plate already locked at the locking position by the locking lever. However, since the locking by this locking lever is released and it moves to the retracted position, the visual field limiting plate moved to the locking position is locked at the locking position by the locking lever. 3 or more pre It enables switching in response to Tomodo, and can provide a finder field switching mechanism which can be downsized.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a finder visual field switching mechanism of the present invention.

FIG. 2 is an external perspective view of a lens-fitted film unit incorporating the finder visual field switching mechanism of the present invention.

3A and 3B are explanatory views showing states of the viewfinder field switching mechanism of FIG. 1 in respective modes.

FIG. 4 is a circuit diagram of a print mode recording device incorporated in the lens-fitted film unit of FIG.

5 is an explanatory view showing a photographic film taken by the lens-fitted film unit of FIG. 2. FIG.

FIG. 6 is an explanatory diagram of a finder visual field switching mechanism according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Finder field-of-view switching mechanism 2 Film unit with lens 3 Unit body 6 Finder 7, 8 Field-of-view limiting plate 9 Reset plate 17 Locking lever

Claims (2)

[Claims] 1. A finder visual field switching mechanism for changing a visual field range of a finder provided in a camera or a film unit with a lens, comprising: a locking position in the finder or on a front surface, and a retracted position out of the locking position. And at least two independent field limiting plates each having an opening of a different size for limiting the field of view of the finder, and locking the field limiting plates in the locking position. And a locking lever for moving the one field-of-view limiting plate to the locking position, another field-of-view limiting plate already locked at the locking position by the locking lever. However, the locking by the locking lever is released to move to the retracted position, and the visual field limiting plate moved to the locking position is locked to the locking position by the locking lever. Field of view switching mechanism. 2. A finder visual field switching mechanism for changing a visual field range of a finder provided in a camera or a film unit with a lens, wherein a locking position in the finder or on a front surface and an intermediate position where one end of the finder is covered with a certain width. And a field limiting plate that is movable between a retracted position that is completely disengaged from the locking position and that has an opening for limiting the field of view in the vertical direction of the finder, and in conjunction with the field limiting plate, When the field-of-view limiting plate is in the intermediate position, the other end of the finder is covered with a certain width to limit the horizontal field of view of the finder together with the field-of-view limiting plate. The viewfinder field switching mechanism is characterized in that an interlocking plate for completely retracting from the viewfinder is provided in the case of.