JP3368670B2 - camera - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly to a camera capable of recording trimming information on a recording medium.

[0002]

2. Description of the Related Art Conventionally, a print aspect ratio information recording camera disclosed in Japanese Patent Laid-Open No. 1-282531 has been proposed as a camera capable of recording print aspect ratio information, that is, trimming information. is there. This camera has a finder mask operation unit for setting an aspect ratio of a print and an LED for recording the aspect ratio information, and records the print shooting screen aspect ratio set by the finder mask operation unit on a film. Is.

Further, the trimming information recording camera disclosed in Japanese Utility Model Laid-Open No. 5-6439 has means for setting a finder mask having a plurality of frames and means for recording trimming information, and is used for photographing operation. It was characterized in that the mask returned to the initial position in conjunction with it.

Further, the camera disclosed in Japanese Unexamined Patent Publication No. 4-233525 is a camera capable of changing the viewfinder magnification in conjunction with the viewfinder field frame switching operation.
The finder field frame switching mechanism as shown in 0 is built in. The viewfinder field switching mechanism moves two field masks 116 slidably supported between two Porro prisms 115 by moving the P ring 113 in an oblique direction along the two guide pins 115a. Then, the field frame size is switched.

[0005]

However, the above-mentioned Japanese Patent Laid-Open No. 1-282531 and Japanese Utility Model Laid-Open No. 5-6.
In the camera disclosed in Japanese Patent No. 439, when the trimming size becomes plural, the escape space of the finder mask becomes extremely large. Further, when switching the mask, there is a problem that it is difficult to see because the boundary between the field frames passes.

Further, in the camera disclosed in Japanese Patent Laid-Open No. 4-233525, when the finder field frame is switched to another size, the field mask 116 moves vertically and horizontally simultaneously with respect to the full size state. Therefore, there is a problem that trimming only in the vertical direction or only in the horizontal direction is impossible.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a camera capable of switching a plurality of trimmings without causing a feeling of strangeness when switching a viewfinder frame. .

[0008]

According to another aspect of the present invention, there is provided a camera for recording trimming information of a photographing screen in a recording medium, wherein a first state indicating a full size of the photographing screen and the full size are set. In contrast, partially covers the vertical direction
In this way, the second state showing the vertical trimming of the shooting screen and the horizontal direction with respect to the full size are partially covered.
Then , the viewfinder field frame size state can be switched to a third state showing lateral trimming of the photographing screen, and the second view state can be changed to the third state or the third state can be changed to the above state. When switching the size of the field frame to the second state, be sure to switch to the maximum state without going through the third or second state.
First , the second state-second
First state-third state, or third state-first state-
It is characterized in that it is provided with a field-of-view frame switching means arranged so that the switching order is the second state .

Another camera of the present invention is a camera for recording trimming information of a photographing screen on a recording medium,
A first mask for vertically trimming the viewfinder frame and a second mask for horizontally trimming the viewfinder frame.
And the first and second masks are in a retracted position where trimming is not performed, the first mask is in a trimming position, and the second mask is in a retracted position. The viewfinder field frame can be switched between the second state and the third state in which the first mask is in the retracted position and the second mask is in the trimming position. When switching the view frame size to the state or from the third state to the second state, be sure to first go through the first state without passing through the third or second state. The second state-the first state-
Third state, or third state-first state-second state
And a visual field frame switching means arranged so as to achieve the switching order .

Still another camera of the present invention is a camera for recording trimming information of a photographic screen on a recording medium, and moves to a trimming position for performing vertical trimming of a finder field frame and a retracting position for not performing trimming. A first mask means composed of a pair of mask plates, a second mask means composed of a pair of mask plates that moves to a trimming position for performing lateral trimming of the finder field frame and a retracted position for not performing trimming, and a photographing screen. Of the third mask means for forming a finder field corresponding to the full size of the first mask means, and the first and second mask means for the third mask means are both in the retracted position where trimming is not performed. State, the first mask means is at the trimming position, and the second mask means is at the retracted position with respect to the third mask means. The finder field frame can be switched between a certain second state and a third state in which the first mask means is in the retracted position and the second mask means is in the trimming position with respect to the third mask means. Therefore, when switching the view frame size from the second state to the third state, or from the third state to the second state, be sure not to go through the third or second state once. First, above first
The second state-the first state-the first state
3 states, or third state-first state-second state
The field-of-view frame switching means is arranged so as to be in such a switching order, and the field-of-view frame switching means is a first interlocking means for interlockingly moving the first mask means consisting of a pair of mask plates between the trimming position and the retracted position. Means, a second interlocking means for interlocking the second mask means consisting of a pair of mask plates to a trimming position and a retracted position, and one mask of the pair of mask plates of the first mask means. Plate and one of the pair of mask plates of the second mask means are engaged to selectively drive one of the first mask means and the second mask means. And a single drive member.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a main part of an optical system of a camera showing a first embodiment of the present invention. The camera of this embodiment is a single-lens reflex camera 1, and in the camera 1,
A main mirror 4 is arranged between the film 9 and the taking lens 2 so that the main mirror 4 can be retracted by about 45 °. The main mirror 4 partially bends the optical path 3 of the optical axis O of the photographing lens upward. Then, a horizontally inverted image is formed on the focusing screen 5, and the pentaprism 7 makes an erect normal image, and the subject image of the erect normal image is enlarged and observed by the eyepiece 8. Between the focusing screen 5 and the pentaprism 7, a viewfinder field frame switching mechanism 6 which is a field frame switching means for switching the photographing screen size is arranged.

FIG. 2 is a perspective view showing a modification in which the viewfinder frame switching mechanism 6 mounted on the single-lens reflex camera 1 of the first embodiment is attached to the compact camera 10 as it is. This compact camera 10
In, the first prism 14 of the two triangular prisms,
By arranging the second prism 16 in a state of being rotated by 90 °, the light incident from the finder objective lens 13 is horizontally inverted by the first prism 14 and vertically inverted by the second prism 16. Since it is inverted, it becomes an erect normal image, and the subject image of the erect normal image can be magnified and observed by the eyepiece lens 17. The finder field frame switching mechanism 6 is arranged near the focal point.

FIG. 3 is a schematic block diagram of a control unit for controlling the switching of the photographing screen size in the camera of the first embodiment. In the control section, by operating the mask operating member 52 which is the aspect ratio setting means 21 for setting the aspect ratio of the photographing screen, that is, the photographing screen size, the finder field frame of the finder field frame switching mechanism 6 is set. To switch to the shooting screen size compatible mode. Then, the aspect ratio information regarding the aspect ratio of the above-mentioned photographing screen size is input to the control circuit 19.

When the photographer presses the release switch and the release signal 20 is input to the control circuit 19 to complete the photographing, the film feeding means 53 feeds the film. During the feeding period, the aspect ratio information is recorded on the film surface by the aspect ratio information recording means 22 such as an optical recording means using an LED or a magnetic recording means. Note that the aspect ratio information is read out and trimming of the print screen is performed when printing is performed after the end of shooting.

Next, the structure of the viewfinder field frame switching mechanism 6 will be described with reference to the mechanism layout diagram of FIG.
As shown in FIG. 4, the present mechanism 6 is mainly composed of a pair of mask plates, and serves as a first mask in the vertical direction, that is, in the vertical direction for trimming the field frame. Lateral direction as the second mask consisting of a plate, that is,
Left and right masks 29 and 30 for left and right trimming,
A cam gear 35 having a cam 34 as a cam means, a vertically movable mask operating member 52 as the aspect ratio setting means 21, and upper and lower masks 24 and 25 which are aspect ratio information.
Upper and lower trimming switches 27 for detecting the trimming movement position of the left and right, and left and right masks 29, 3 which also have aspect ratio information.
It is composed of a left and right trimming switch 33 for detecting a trimming movement position of 0.

Two upper mask pins 3 fixed to a camera body (not shown) are provided at one end of the upper and lower masks 24 and 25.
6a and the long hole 2 which is fitted with the lower mask pin 36b, respectively.
4b and 25b are provided and supported so as to be movable in the vertical direction while maintaining the parallel state. Rack part 2 of upper mask 24
Since 4a meshes with the rack portion 25a of the lower mask 25 via the pinion 26 which is the first interlocking means, they interlock and move in mutually opposite directions. In addition, an upper and lower mask retraction spring 28 for urging the upper and lower masks in the direction of always retreating is suspended from the lower mask 25.
The plane contact portion 25c of No. 5 is always in contact with the cam surface of the cam 34.

Therefore, with the rotation of the cam 34, the lower mask 25 is driven and the upper mask 24 also moves in conjunction with each other.
Trimming position (entry position) 24 shown in FIGS.
A, 25A and the retracted positions 24B, 25B will be respectively moved. The mask retreat position is the position of the finder field frame F1 corresponding to the full-size shooting screen, and the trimming position is the finder field frame F.
This is the position where the mask has entered a predetermined position within the range of 1.

The left and right masks 29 and 30 have their long holes 29b and 30b fitted to two left mask pins 36c and right mask pins 36d fixed to the camera body, respectively. It can be kept and moved to the left and right.

The rack portion 2 arranged on the left mask 29
Since 9a meshes with the rack portion 30a of the right mask 30 via the pinion gear 31 which is the second interlocking means,
The left and right masks 29 and 30 are interlocked and move in mutually opposite directions. Further, a left and right mask retraction spring 32 for urging the left and right masks 29 and 30 in the direction of always retreating is suspended on the left mask 29, and the plane contact portion 3 of the right mask 30 is suspended.
0c is always applied to the cam 34. Therefore, with the rotation of the cam 34, the right mask 30 is driven, and the left mask 29 also moves in conjunction with each other, and the trimming positions of FIGS. 4 and 5 described later, that is, the entry positions 29B and 30B and the withdrawal position 29.
They will move to A and 30A respectively.

The cam 34 integrally provided on the cam gear 35 has a cam surface having a bottom circular portion 34a and an outer circular portion 34b.
It is formed by. The cam gear 35 meshes with the rack portion 52d of the vertically movable mask operating member 52, and by operating the mask operating member 52 in the vertical direction, the cam 34 rotates.

The mask operating member 52 is vertically guided by a long hole 52b fitted with a fixed operating member pin 36e provided on the camera body. The operation member 5
2 is provided with an operating portion 52a and an elastically displaceable click portion 52c that is clicked and held at a specified position above or below the operating member 52.

The upper and lower trimming switches 27 are
When the lower masks 24 and 25 are moved downward and upward to the trimming positions 24B and 25B, respectively, the lower mask 25
It is operated at the tip of the to output an ON signal as aspect ratio information. The left and right trimming switch 33 is operated at the tip of the right mask 30 when the left and right masks 29 and 30 are moved to the trimming positions 29B and 30B, which are moved to the right and left, respectively, and outputs an ON signal as aspect ratio information. To do.

Next, the switching operation of the viewfinder field frame switching mechanism 6 of the camera of the present embodiment having the above-mentioned structure will be described with reference to the operation diagrams of FIGS. The state shown in FIG. 4 is a state in which the mask operating member 52 is returned to the neutral position, and the bottom circular portion 34a of the cam 34 contacts the lower mask contact portion 25c and the right mask 30 contact portion 30c. The upper and lower masks 24, 25
The left and right masks 29 and 30 are located at the most retracted retreat positions 24A, 25A, 29A and 30A, respectively, and form a field frame F1 corresponding to the full size of the photographing screen. The state set in the field frame F1 is referred to as a first state.

When the mask operating member 52 is slid upward from the first state shown in FIG. 4, the cam 34 is rotated counterclockwise through the rack 52d and the cam gear 35 to the state shown in FIG. At this time, the contact portion 25c of the lower mask 25 is pressed by the outer circular portion 34b of the cam 34, and the trimming position 2
Move to 5B. The upper mask 24 is also moved via the pinion 26 and is also located at the trimming position 24B. On the other hand, the contact portion 30c of the right mask 30 is kept in contact with the bottom circular portion 34a of the cam, and the left and right masks 29, 30 are in the retracted positions 29A, 3A similar to those in the state of FIG.
It is at 0A. In the state shown in FIG. 5, a vertical trimming visual field frame F2 corresponding to a trimming screen in which only the vertical direction (vertical direction) of the full-size shooting screen is trimmed is formed. The state set in the field frame F2 is referred to as a second state. When set in this state,
The upper and lower trimming switch 27 is turned on, and the signal is input to the control circuit 19 as aspect ratio information.

When the mask operating member 52 is slid downward from the first state shown in FIG. 4, the rack 52d,
The cam 34 is rotated clockwise through the cam gear 35 to the state shown in FIG. 5, and as shown in FIG.
0 is moved to the trimming positions 29B and 30B, and the horizontal trimming visual field frame F3 corresponding to the trimming screen in which only the left-right direction (horizontal direction) of the full-size shooting screen is trimmed is formed. The state set in the field frame F3 is referred to as a third state. When set in this state, the left and right trimming switch 33 is turned on, and the signal is input to the control circuit 19 as aspect ratio information.

The finder field frame F3 in the third state to the finder field frame F3 in the third state is used.
4 or when switching from the state of the finder field frame F3 in the third state to the state of the finder field frame F2 in the second state, the mask operating member 52 is temporarily shown in FIG. Since the finder field passes through the neutral position, the finder field is switched to the state of the finder field frame F2 or F3, which is the first state, of the finder field frame F1 corresponding to the full-size screen. .

In the camera of this embodiment, when setting the photographing screen size, the field frame F1 corresponding to the full size is used as a reference, and when the operating member 52 is slid upward, the field frame switching mechanism 6 causes the finder field frame. Can be switched to the field frame F2 corresponding to the shooting screen for trimming only in the vertical direction (vertical direction). Further, by sliding the operation member 52 downward, the viewfinder field frame can be switched to the field frame F3 corresponding to the shooting screen for trimming only in the horizontal direction (horizontal direction).

At the time of switching, the aspect ratio information is output to the control circuit 19 by the output signal of the upper and lower trimming switches 27 or 33 corresponding to the trimming state.
The aspect ratio information recording means 22 records the aspect ratio information on the film surface when the film is wound after being photographed. The aspect ratio information is read out and referred to at the time of printing, and the trimming of the print is performed based on the information.

When switching to the field frames F2 and F3 for up / down or left / right trimming by the field frame switching operation, the upper / lower mask 24 is used because the field frame F1 corresponding to the full size is always switched. Two
5 and the left and right masks 29 and 30 do not move at the same time. Therefore, when switching the viewfinder frame while looking through the viewfinder, the movement of the mask looks natural, and
There is no need to worry about erroneous operations. In addition, the field frame switching mechanism 6
The mechanism itself is also simplified, and the retreat space for each mask can be kept small.

In the visual field frame switching mechanism 6 of the camera of this embodiment, the moving cam 34 of each mask is a single cam. As a modified example, the upper and lower masks and the left mask are used. The right masks may be driven by cams that are separate members.

Next, the finder field frame switching mechanism of the camera of the second embodiment of the present invention will be described. The optical system of the camera of the present embodiment and the control unit for switching the shooting screen size are the same as those of the camera of the first embodiment shown in FIGS. 1 and 3.

FIG. 7 shows a viewfinder field frame switching mechanism 60 which is a field frame switching means of the camera of this embodiment. The visual field frame switching mechanism 60 mainly includes upper and lower masks 38 and 39 for vertical trimming as a first mask composed of a pair of mask plates and a lateral direction as a second mask composed of a pair of mask plates. Left and right masks 42 and 43 for trimming, and a third corresponding to the full size shooting screen
Frame 37 as a mask, a cam 45 as a first cam means, and a cam 4 as a second cam means
6, a cam gear 47 having a position 6, a vertically movable mask operating member 55 as the aspect ratio setting means 21, and an up / down trimming switch for detecting aspect ratio information, that is, trimming movement position information of the upper and lower masks 38, 39. 50 and a left / right trimming switch 51 for detecting the trimming movement position information of the left and right masks 42 and 43, which is also aspect ratio information.

The upper and lower masks 38, 39 have their fitting portions 38b, 39b fitted in the guide shaft 40, and are supported slidably in the vertical direction. Upper and lower mask 38,
A direction in which the upper and lower mask springs 41, which are the first biasing means suspended from the tips of the foot portions 38a and 39a of the foot 39, constantly contact the foot portions 38a and 39a of the lower masks 38 and 39 with the cams 45 and 46, that is, , Is biased in the trimming direction.

The left and right masks 42 and 43 have their long holes 42b and 43b fitted in the left mask pin 49a and the right mask pin 49b fixed to the camera body, and are supported so as to be slidable in the left and right directions. . Also, left and right mask 3
The left and right mask springs 44, which are the second urging means suspended on 8 and 39, always urge the foot portions of the left and right masks 42 and 43 in the direction of contacting the cams 45 and 46, that is, in the retreating direction. There is.

The cams 45 and 46 have a two-step cam shape, and the cams 45 move the masks 38 and 42 to the retracted positions 38A and 42A and the trimming positions 38B and 42B.
(See FIGS. 8 and 9). The cam 46 drives the masks 39 and 43 to the retracted positions 39A and 43A and the trimming positions 39B and 43B (see FIGS. 8 and 9). The mask retreat position is a position where the mask retreats from the range of the finder field frame F1 (see FIG. 7) of the finder frame 37 which is a finder field frame corresponding to a full-size shooting screen, and a trimming position. Is a position which has entered and moved to a predetermined position within the range of the viewfinder frame F1.

The two-stage cams 45 and 46 are integrally formed on the cam gear 47, and the rack portion 55d of the mask operating member 55 is provided via a planet gear (not shown).
Is driven to rotate.

The operation member 55 has an operation portion 55a for sliding operation, an elastically deformable click portion 55c for holding the operation member 55 at a selected switching position, and an elongated hole 5.
5b is provided. A guide pin 49c fixed to a camera body (not shown) is fitted in the long hole 55b, and the operation member 55 is slidable up and down.

Next, the switching operation of the viewfinder field frame switching mechanism 60 of the camera of the present embodiment constructed as described above will be described with reference to the operation diagrams of FIGS. 7 and 8 and 9. When the mask operating member 55 is in the neutral position, the upper and lower masks 38 and 39 and the left and right masks 42 and 43 are respectively cams 45 and 4 as shown in FIG.
6 are in contact with the outer circle portions 45b and 46b and the bottom circle portions 45a and 46a, and both are in the retracted positions 38A, 39A and 42A, 4A.
It is located at 3A. The finder field in this state is a field frame F1 by the finder frame 37 corresponding to the full-size shooting screen, and this state is referred to as a first state.

Then, when the operating member 55 is moved upward from the neutral position, as shown in FIG.
5 and 46 rotate counterclockwise by 90 °, the upper and lower masks 38 and 39 come into contact with the cam bottom circle portions 45a and 46a, and move to the trimming positions 38B and 39B.
At this time, the left and right masks 42 and 43 have the cams 45 and 46.
Abutting against the bottom circular portions 45a and 46a of the
A, at 43A. In this state, the field of view of the finder is a finder field frame F2 for vertical trimming that corresponds to a vertically (vertically) trimmed shooting screen, and this state is referred to as a second state. Then, in this state, the vertical trimming switch 50 arranged above the operating member 55 is turned on. This signal is taken in by the control circuit 19 as aspect ratio information and recorded on the film when the film is fed after photographing.

When the operating member 55 is moved downward from the neutral position, the cams 45, 4 are moved as shown in FIG.
6 rotates 90 ° clockwise, and the left and right masks 4 are
2, 43 are in contact with the cam outer circles 45b, 46b, and move to the trimming positions 42B, 43B. At this time, the upper and lower masks 38, 39 are attached to the cam outer circles 45b, 4
It is in contact with 6b and is in the retracted positions 38A, 39A.
In this state, the field of view of the finder is a finder field frame F3 for horizontal trimming corresponding to the left and right (horizontal direction) trimming photographing screen, and this state is referred to as a third state. Then, in this state, the left and right trimming switch 51 arranged below the operation member 55 is turned on.
This signal is taken in by the control circuit 19 as aspect ratio information and recorded on the film when the film is fed after photographing.

Even in the finder field frame switching mechanism 60, the finder field frame F in the second state is also used.
2 to the state of the finder field frame F3 in the third state, or the state of the finder field frame F in the third state
When the state of 3 is switched to the state of the finder field frame F2 in the second state, the mask operating member 55
Are temporarily switched to the respective finder field frame states through the state of the finder field frame F1 corresponding to the full size screen which is the first state shown in FIG.

As described above, in the camera of this embodiment, by using the cams 45 and 46 having the two-stage structure,
By driving the four masks on the left and right, respectively, the same effect as that of the first embodiment can be obtained. In particular, in the present embodiment, the pinion drive system is not required, and instead, a spring is applied so that the mask is brought into contact with and driven by the cam surface. The size of the camera can be reduced, and the size of the camera can be reduced.

Further, in the present embodiment, the switching field frame is F1 for full size and F for vertical trimming.
2, the left and right trimming F3 is switched to three types. As a modified example, the upper and lower masks 38, 39,
Alternatively, a method can be proposed in which the trimming positions of the left and right masks 42 and 43 are switched in multiple stages so as to correspond to the trimming photographing screens of various sizes.

(Supplementary Note) According to the embodiment described above, a camera having the following configuration can be proposed. (1) In a camera for recording trimming information of a photographing screen on a recording medium, an aspect ratio setting means for setting an aspect ratio of the photographing screen, and an aspect ratio information recording means for recording the aspect ratio information by the aspect ratio setting means on a film. A first mask for trimming the finder field frame in the vertical direction, a second mask for trimming the finder field frame in the horizontal direction, and an entry position and trimming for trimming the first and second masks. And a finder field frame switching means for switching to a retreat position where the other mask is positioned at the retreat position when one of the masks is moved to the retreat position. And the camera. According to the above-mentioned camera, it is possible to perform the trimming only in the vertical direction or the trimming only in the horizontal direction by the visual field frame switching means configured by a simple mechanism.

(2) In a camera for recording trimming information of a photographic screen on a recording medium, a first mask plate which moves to a trimming position for performing vertical trimming of a viewfinder field frame and a retreat position for not performing trimming. Mask means, a second mask means composed of a pair of mask plates which moves to a trimming position where the finder field frame is trimmed in the left-right direction and a retreat position where trimming is not performed, and the first and second masks. First state in which both means are in the retracted position, the first mask means is in the trimming position, the second mask means is in the retracted position, and the first mask means is in the retracted position. To
A camera, comprising: a field-view frame switching unit capable of switching the finder field frame to a third state in which the second mask unit is in the trimming position. From the second state to the third state by the visual field frame switching means,
Alternatively, when the finder field frame is switched from the third state to the second state, the first state corresponding to the full size is passed, so that the field frame switching state is easy to see and is easy to operate. Become.

(3) In the camera for recording the trimming information of the photographing screen on the recording medium, the first mask is composed of a pair of mask plates which are moved to a trimming position for performing vertical trimming of the viewfinder field frame and a retracting position for not performing trimming. Mask means, a second mask means composed of a pair of mask plates that moves to a trimming position where the finder field frame is trimmed in the left-right direction and a retreat position where the finder field frame is not trimmed, and a finder field equivalent to the full size of the photographing screen And a third state in which the first and second mask means are both in a retracted position where trimming is not performed with respect to the third mask means, and the third mask means. A second state in which the first mask means is in a trimming position and the second mask means is in a retracted position with respect to the mask means; Note that the first mask is provided with respect to the third mask means, and the second mask means is provided with a visual field frame switching means capable of switching the viewfinder visual field to a third state in which the second mask means is at the trimming position. A camera that is characterized by what it has done. When switching the finder field frame from the second state to the third state or from the third state to the second state by the field frame switching means, the first state corresponding to the full size is passed. Since this is done, it becomes easier to see the switching state of the field frame, and the operation becomes easier.

(4) In Supplementary Note (2) or Supplementary Note (3), the visual field frame switching means moves the first mask means composed of a pair of mask plates in conjunction with the trimming position or the retracted position. Any one of the first interlocking means for moving the first interlocking means and the second interlocking means for interlocking the second masking means including a pair of mask plates with the trimming position or the retracted position, and the first masking means. A camera, comprising: one mask plate and one of the second mask units, and a cam unit that selectively drives one of the mask units. The interlocking means is provided in the viewfinder field frame switching mechanism of the present camera, and reliable switching can be performed by a simple mechanism.

(5) In Supplementary Note (2) or Supplementary Note (3), the visual field frame switching means is one of a pair of mask plates of the first mask means and a pair of the second mask means. First cam means that engages with one of the mask plates and selectively drives one of the mask plates; the other of the pair of mask plates of the first mask means; Second cam means for engaging with the other of the pair of mask plates of the second mask means and selectively driving one of the mask plates, and first mask means composed of the pair of mask plates From a pair of mask plates, a first urging device that urges one mask plate in a direction in which it contacts the first cam device and another mask plate in a direction in which it contacts the second cam device. One of the mask plates of the second mask means is brought into contact with the second cam means. Direction, the first and the other mask plate 2
Second urging means for urging the cam means in the direction of abutting against the cam means. The field-of-view frame switching means of this camera does not require any interlocking means, and the mechanism is simplified.

[0049]

As described above, according to the camera of the first aspect of the present invention, when the viewfinder frame is switched to the vertical trimming or the horizontal trimming, the viewfinder frame corresponding to the full size is temporarily provided. Since it is possible to switch the field frame, it is easy to see the switching state of the field frame, and the operation is easy.

According to the camera of the second and third aspects of the present invention, when the finder field frame is similarly switched to the vertical trimming or the horizontal trimming, the finder field frame corresponding to the full size is temporarily switched. Since this is done, it becomes easier to see the switching state of the field frame, and it becomes easier to operate. Further, the space for retracting the field frame can be minimized, and the camera can be downsized.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a main part of a finder optical system of a single-lens reflex camera showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a modified example in which the viewfinder frame switching mechanism mounted on the camera of the first embodiment is mounted on a compact camera.

FIG. 3 is a schematic block configuration diagram of a control unit for screen size switching control in the camera of the first embodiment of FIG.

4 is a layout view of a viewfinder field frame switching mechanism of the camera of FIG.

5 is an operation view of the viewfinder field frame switching mechanism of FIG. 4 at the time of vertical trimming.

FIG. 6 is an operation diagram of the viewfinder field frame switching mechanism of FIG. 4 at the time of left and right trimming.

FIG. 7 is a layout view of a viewfinder field frame switching mechanism of the camera of the second embodiment of the present invention.

8 is an operation diagram of the viewfinder frame switching mechanism of FIG. 7 at the time of vertical trimming.

9 is an operation diagram of the viewfinder frame switching mechanism of FIG. 7 at the time of left and right trimming.

FIG. 10 is a perspective view of a conventional viewfinder field frame switching mechanism.

[Explanation of symbols]

52, 55 ... Mask operating member (aspect ratio setting means) 24A, 25A, 29A, 30A, 38A, 39A, 4
2A, 43A ..... Mask retreat positions 24B, 25B, 29B, 30B, 38B, 39B, 4
2B, 43B ………… Mask trimming position (entry position) 37 ………… Finder frame (third mask) 38 ………… Top mask (first mask) 39 ………… ………… Lower mask (first mask) 42 ……………… Left mask (second mask) 43 ……………… Right mask (second mask) F1 ………… In the first state Full-size compatible viewfinder field frame F2 ..... Viewfinder frame F3 for vertical trimming in the second state .... Viewfinder frame for horizontal trimming in the third state.

Continuation of the front page (56) References JP-A-1-282531 (JP, A) JP-A-6-35036 (JP, A) Actual development 5-6539 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) G03B ^7/ 00-7/28 G03B 13/00-13/28 G03B 17/02 G03B 17/22-17/34 G03B 17/38-17/46 G03B 19/00-19 / 16

Claims (3)

(57) [Claims] 1. A camera for recording trimming information of a photographing screen on a recording medium, comprising: a first state indicating a full size of the photographing screen ;
In the second state, which shows the vertical trimming of the shooting screen by partially covering the vertical direction ,
In contrast, it is possible to switch the state of the viewfinder frame size to the third state in which the lateral direction is partially trimmed so as to show the horizontal trimming of the photographing screen. From the second state to the third state. , Or when switching the field-of-view frame size from the third state to the second state, the
Alternatively , the second state-the first state-the third state, or the first state is first passed through without passing through the second state.
Is the third state-first state-second state switching
A camera comprising a field-of-view frame switching means arranged in order . 2. A camera for recording trimming information of a photographing screen on a recording medium, comprising: a first mask for vertically trimming a viewfinder field frame; a second mask for horizontally trimming a viewfinder field frame; A first state in which the first and second masks are both in a retracted position where trimming is not performed, a first state in which the first mask is in a trimming position, and a second state in which the second mask is in a retracted position; The viewfinder field frame can be switched to a third state in which the first mask is in the retracted position and the second mask is in the trimming position, and the second state is switched to the third state or when from the third state to switch the field frame size to the second state, always once, said first
The second state-the first state-the third state, and the first state is first passed without going through the third or second state.
Or switching from the third state-the first state-the second state
And a field frame switching means arranged in a predetermined order. 3. A camera for recording trimming information of a photographing screen on a recording medium, comprising a pair of mask plates which move to a trimming position for performing vertical trimming of a finder field frame and a retracting position for not performing trimming. The mask means, the second mask means composed of a pair of mask plates which are moved to the trimming position for performing the horizontal trimming of the viewfinder frame and the retracted position for not performing the trimming, and the viewfinder field corresponding to the full size of the photographing screen are provided. A third mask means to be formed, a first state in which the first and second mask means are both in a retreat position where trimming is not performed with respect to the third mask means, and the third mask means. Against the first
Second mask means in the trimming position, the second mask means in the retracted position, and the first mask means in the retracted position with respect to the third mask means, and the second mask means. The viewfinder frame can be switched to the third state in which the field frame size is in the trimming position, and the view frame size can be changed from the second state to the third state or from the third state to the second state. when switching, always once, above
Without passing through the serial third or second state, initially so as to go through the first state, the second state - the first state - a third Jo of
State or third state-first state-second state
The field-of-view frame switching means is arranged in a switching order, and the field-of-view frame switching means moves the first mask means composed of a pair of mask plates in an interlocking manner between a trimming position and a retracted position. Any one of the interlocking means, the second interlocking means for interlocking the second mask means including the pair of mask plates to the trimming position and the retracted position, and the pair of mask plates of the first mask means. The mask plate and one of the pair of mask plates of the second mask means are engaged to selectively drive one of the first mask means and the second mask means. And a single drive member for controlling the camera.