JPH08286265A - Camera - Google Patents

Abstract

PURPOSE: To provide a camera capable of setting a photographing range and shifting visual field masks to a photographing visual field region corresponding to a desired photographing range, only with a single operation of an external operation member. CONSTITUTION: The camera is provided with aperture masks 6 and 7 moved with respect to the aperture of a camera main body, to vary the photographing range, visual field masks 10b and 11b which are arranged in proximity to a reticle 13 in a finder optical system capable of varying the photographing visual field region, an operation member 1 arranged outside the camera main body and changing means 8, 9, 10 and 11 for shifting the aperture masks to the desired photographing range with the operation of the operation member and the visual field masks to the photographing visual field region corresponding to the desired photographing range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera capable of switching a normal photographing range and a photographing range of, for example, a panoramic photograph,
In particular, the present invention relates to a movable visual field frame provided in a viewfinder of a single-lens reflex camera and a driving mechanism for an aperture mask.

[0002]

2. Description of the Related Art Conventionally, the viewfinder structure of a single-lens reflex camera capable of switching between normal photography and, for example, panoramic photography, uses an external operation member provided in the camera body as described in Japanese Utility Model Laid-Open No. 4-130933. When manually operated, the focusing screen mounted inside the camera body is cured to drive the two thin rod-shaped visual field frames to provide a visual field range according to the photographing range.

As for the mechanism for changing the photographing range, as described in Japanese Patent Publication No. 3-238440, a photographing range for panoramic photographing which can be moved with respect to the aperture by an external operation member of the camera. A device that drives the regulating member has been proposed.

[0004]

However, in the above-mentioned conventional single-lens reflex camera, in order to display the field of view of normal photography and, for example, a panoramic picture in the viewfinder, the driving method of the external operation member and the movable field-of-view frame. However, the photographer had to previously determine the shooting range for the aperture.

Even if the photographing range of the aperture can be changed by an external operating member, the photographing range is formed in advance by engraving the photographing range on the focusing screen of the finder. Due to the refraction of light, etc., the line of sight is always visible,
The photographer sometimes could not confirm the shooting range while looking through the viewfinder.

An object of the first invention of the present application is to provide a camera capable of setting a photographing range and changing a visual field mask to a photographing visual field region according to a desired photographing range by only one operation of an external operating member. Especially.

An object of a second invention according to the present application is to make the changing means compact in a camera that realizes the above-mentioned first object.

A third object of the present invention is to arrange a visual field mask in a camera that realizes the above-described first and second objects by effectively utilizing the space of the camera.

[0009]

The structure for realizing the object of the first invention of the present application is such that, as described in claim 1, the photographing range is changed by moving with respect to the aperture of the camera body. An aperture mask, a field mask disposed close to a focusing screen in a finder optical system for varying a shooting field area, an operation member disposed outside the camera body, and the aperture mask operated by the operation member. To a desired photographing range, and a changing means for changing the visual field mask to a photographing visual field region according to the desired photographing range.

In this structure, when the operating member is operated, the changing means moves the aperture mask to set a desired photographing range, and at the same time, the visual field mask is set to a photographing visual field area corresponding to the set photographing range.

The structure for realizing the object of the second invention according to the present application is, as described in claim 2, in claim 1.
The changing unit is a camera characterized in that a drive unit for driving the field mask is provided on the opposite side of the drive unit for driving the quick return mirror with the quick return mirror interposed therebetween.

With this configuration, for example, one side of the mirror box, in which the quick return mirror is housed, which is not used, can be effectively used.

According to a third aspect of the present invention, the field mask according to the first or second aspect of the invention has a field mask between the focusing screen and the erect image forming optical element. In the normal shooting position, the light beam is placed in a polygonal area between the focusing screen and a member that integrally holds the erecting image forming optical element outside the effective light beam area in the normal shooting state. The camera is characterized by.

In this structure, the field mask can be arranged by effectively utilizing the space between the focusing screen and the erecting image forming optical element such as the penta roof prism.

[0015]

FIG. 1 is a partially exploded perspective view of the essential parts of an embodiment in which the present invention is applied to a single-lens reflex camera with a variable shooting range.

Reference numeral 1 denotes an external operation member for switching between normal photography and, for example, panoramic photography, which is provided on the bottom lid 2 on the back side of the camera as shown in FIG. Reference numeral 3 denotes a click spring, which is fixed to the external operation member 1 so as to sandwich the bottom cover 2, and along a corrugated meat pressure change portion (not shown) formed inside the bottom cover 2, a normal photographing position and, for example, a panorama. Give a click feeling to the shooting position. Reference numeral 4 denotes a slider, which operates by interlocking the movement of the external operation member 1 in the same direction inside the camera body. 5 corresponds to the movement of the slider 4,
It is an aperture switching lever that rotates.

Aperture masks 6 and 7 follow the movement of the aperture switching lever 5 to change the photographing range. Reference numeral 8 denotes a finder switching lever that rotates in synchronization with the movement of the slider 4 and in synchronization with the aperture switching lever 5. Reference numeral 9 denotes a finder switching cam lever which moves in association with the movement of the finder switching lever 8. Reference numerals 10 and 11 are viewfinder field levers which are rotated by the cam surface of the viewfinder switching cam lever 9.

A mirror box 12 includes a quick return mirror (not shown), a focusing screen 13, and a fixed field mask 1.
4. The erecting image forming optical element 15 is integrally held, and the viewfinder switching cam lever 9 and the viewfinder field levers 10 and 11 are arranged on the side surface on the opposite side of the quick return mirror drive mechanism (not shown).

FIG. 3 is a partial perspective view of the aperture at the normal photographing position. The position of the external operation member 1 with respect to the bottom cover 2 is as follows.
It is in the normal shooting position, and the slider 4 is also in the same position.
In the above state, the aperture switching lever 5 is biased leftward in the figure by the 16 aperture switching springs, and the L-shaped aperture masks 6 and 7 have the support shafts 5a and 5b at both ends of the aperture switching lever 5, respectively. Fixed shafts 17a and 17b that are axially supported through and are planted in the mirror box 12,
Cam grooves 6a and 7a formed in the aperture masks 6 and 7
As a result, with respect to the photographing range 18 indicated by the chain double-dashed line, one of the aperture masks 6 is in the normal photographing position, which is retracted downward in the figure, and the other aperture mask 7 is retracted upward in the figure.

Further, in FIG. 3, the finder switching lever 8 is pivotally supported in the same direction as a support shaft that pivotally supports the aperture switching lever 5 for rotation and rotation, and at the position rotated clockwise as shown in FIG. It is in the normal photographing position shown in FIG.

In FIG. 4, the viewfinder switching cam lever 9 uses vertical guide shafts 12a and 12b integrally formed on the side of the mirror box 12 opposite to the quick return mirror drive mechanism (not shown) as guides. The position is regulated by the guide groove 9a extending in the vertical direction, and the cam lever spring 19 constantly urges the normal photographing position which is located above the sheet surface. Further, the finder switching cam lever 9 also regulates clockwise rotation of the finder switching lever 8.

The finder switching levers 10 and 11 are arranged symmetrically with respect to the vertical movement axis of the finder switching cam lever 9, and the finder switching lever springs 2 are respectively arranged.
They are urged in the directions away from each other by 0, 21,
The stopper formed on the mirror box 12 is a protrusion 12
The normal photographing position is held and regulated by abutting on c and 12d. 10a and 11a are finder switching levers 10 and 1
It is a roller that is rotatably supported with respect to 1, respectively,
The cam portions formed on both sides of the finder switching lever 9 can come into contact with each other. At this time, each lever 10, 11
The rollers 10a and 11a are not in contact with the finder switching cam lever 9.

FIG. 5 is a vertical sectional view at the center position of the optical axis in a normal photographing state, showing the viewfinder switching levers 10 and 11.
10b and 11b of the visual field frame portion of FIG. Reference numerals 22 and 23 denote effective luminous fluxes (indicated by chain double-dashed lines) in the field of view in normal photographing, and are housed in a polygonal dead space formed between the mirror box 12 and the mirror box 12.

Reference numeral 24 is a prism for guiding a light beam from a display (not shown) for displaying photographing information below the finder to the finder. In addition, in FIG. 6, 25 indicates a state displayed by the display.

Further, in the normal photographing state, the visual field frame portions 10b and 11b of the finder visual field lever are completely housed in the fixed visual field mask, which indicates that the photographer is in a position invisible.

Next, the switching operation to, for example, the panoramic photographing state will be described with reference to FIGS.

FIG. 7 is an external view of a camera incorporating the above-mentioned photographing range changing mechanism, and shows that the external operating member 1 is located on the right side of the drawing with respect to the bottom cover 2, for example, at the panoramic photographing position. In FIG. 8, the position of the external operation member 1 with respect to the bottom cover 2 is, for example, a panoramic photographing position, and the slider 4
Is also in the same position. In the above state, the aperture switching lever 5 rotates counterclockwise against the spring of the aperture switching spring 16. In the above state, the aperture masks 6, 7 are pivotally supported by the support shafts 5a, 5b with respect to the aperture switching lever 5, and the fixed shafts 17a,
Due to 17b and the cam grooves 6a and 7a, one aperture mask 6 is located in the upper part of the drawing and the other aperture mask 7 is located in the lower part of the drawing with respect to the normal shooting range. It has been changed to a state. Further, the finder switching lever 8 is rotated with the movement of the slider 4.

In FIG. 9, the finder switching lever 8 is located at the same position as in FIG. 8, and the finder switching cam lever 9 is moved against the guide shafts 12a and 12b of the mirror box 12 against the spring force of the cam lever spring 19. It is guided along the guide groove 9a and moves downward in the drawing.

In the viewfinder field levers 10 and 11,
There are rollers 10a and 11a that are rotatably supported, and the rollers 10a and 11a are moved by the movement of the finder switching cam lever 9.
Is attached to the cam lift 9b and reaches the position of the cam top 9c around the fixed shaft 12e.
Rotates counterclockwise to the position shown in FIG. Similarly, while the roller 11a is in contact with the cam lift 9d, the finder field lever 11 is rotated clockwise to the position shown in FIG. 9 about the fixed shaft 12f to the position of the cam top 9e.

FIG. 10 shows the viewfinder field lever 1
0, 11 shows the observation state in the viewfinder when the view frame portions 10b, 11b have moved to the panoramic position, for example, and the view frame portions 10b, 11b of the viewfinder view levers 10, 11 with respect to the fixed view field mask 14 are within the screen. By entering, the photographer is shown the photographable range.

(Relationship between Examples and Claims) The visual field frame portions 10b and 11b in the examples correspond to the visual field masks in the claims, and include the finder switching lever 8, the finder switching cam lever 9, and the finder visual field lever 10. , 11 correspond to the changing means in the claims.

The finder switching cam lever 9 and the finder visual field levers 10 and 11 correspond to a driving unit for driving the visual field mask of the changing means in the claims.

[0033]

According to the first aspect of the present invention, when the operating member is operated, the changing means moves the aperture mask to set a desired photographing range, and at the same time, the visual field mask also corresponds to the set photographing range. It is set in the imaging field of view.

Further, the visual field mask can be retracted with respect to, for example, a fixed visual field mask showing a normal photographing state, and for example, a visual field mask for panoramic photographing is covered with the fixed visual field mask and becomes an eyesore. In addition, the field of view for panoramic photography and normal photography can be easily discriminated.

According to the second aspect of the present invention, it is possible to effectively use, for example, one side of the mirror box that houses the quick return mirror, which is not used.

According to the third aspect of the invention, the field mask can be arranged by effectively utilizing the space between the focusing screen and the erecting image forming optical element such as the penta roof prism.

Further, since the visual field frame is arranged in the vicinity of the focusing screen, it is possible to form a viewfinder which is easy to see without parallax, while the visual field frame can be arranged at a position where it cannot be seen at all.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts of a camera showing an embodiment of the present invention.

2 is an external perspective view of the rear side of the camera of FIG. 1, showing a normal shooting state.

FIG. 3 is a view showing an assembled state of FIG. 1, showing a normal photographing state.

FIG. 4 is a side view of FIG. 1, showing a normal photographing state.

5 is a cross-sectional view showing the relationship between the focusing screen and the visual field mask section of FIG. 1, showing a normal photographing state.

FIG. 6 is a view showing a state of the finder in the state of FIG.

7 is an external perspective view of the rear side of the camera of FIG. 1, showing a panoramic shooting state.

FIG. 8 is a diagram showing the assembled state of FIG. 1, showing a panoramic photographing state.

FIG. 9 is a side view of FIG. 8 showing a panoramic shooting state.

FIG. 10 shows a state of the finder in the state of FIG.

[Explanation of symbols]

1 ... External operation member 2 ... Bottom lid 4 ... Slider 5 ... Aperture switching lever 6,7 ... Aperture mask 8 ... Filter switching lever 9 ... Finder switching lever 10, 11 ... Finder field lever 13 ... Focus plate 14 ... Fixed field mask 15 ... Erecting image forming optical element

Claims (3)

[Claims] 1. An aperture mask that moves with respect to an aperture of a camera body to make a shooting range variable, a field mask arranged close to a focusing screen in a finder optical system to make a shooting field area variable, and a camera body. And an operating member arranged outside the device, and a changing means for changing the aperture mask to a desired photographing range by operating the operating member and changing the visual field mask to a photographing visual field region corresponding to the desired photographing range. A camera characterized by that. 2. The changing means according to claim 1, wherein the drive unit for driving the visual field mask is provided on the opposite side of the drive unit for driving the quick return mirror with the quick return mirror interposed therebetween. Characteristic camera. 3. The field mask according to claim 1 or 2, wherein the field mask is disposed between the focusing screen and the erecting image forming optical element, and at the normal photographing position, the visual field mask is outside the area of the effective light flux in the normal photographing state. A camera arranged in a polygonal area between a member that integrally holds an erecting image forming optical element.