JPH0862703A - Finder device for camera - Google Patents

Abstract

PURPOSE: To easily exchange a focusing screen in a camera provided with display within finder. CONSTITUTION: The display device within finder for the camera is provided with a 1st display member 6 for executing display within the visual field of a finder, a 2nd display member 5 for executing the display overlapped on the 1st display within the visual field of the finder, an optical system holding member 30 for positioning and holding a finder optical system and the 1st display member 6 and having a display guide means guiding the 2nd display member 5, and a display holding member 20 for holding the 2nd display member 5 in the holding member 30; and the display guide means is provided with a display guide adjusting means capable of adjusting the position of a guide part guiding the 2nd display member 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device in a viewfinder of a camera, particularly a single-lens reflex camera.

[0002]

2. Description of the Related Art Conventionally, as a display device in a finder of a camera, it has been general to display the exposure control information of the camera and the like outside the field of view of the finder. However, due to the recent development of highly electronic cameras, the sophistication of camera functions has been rapidly developing. is there. Therefore, in recent years, a camera has been proposed which performs superimpose display in order to display various kinds of shooting information in the viewfinder field. For example, Japanese Patent Laid-Open No.
As disclosed in JP-A-79826 and JP-A-6-148735, a display element such as a liquid crystal display element for performing a transmissive display is arranged above the focusing screen in the finder optical path of the camera, and is superimposed on a subject image to display various kinds of shooting information. It is configured to display figures and characters, and a superimpose display is provided within the viewfinder by the liquid crystal display element.
The display for selectively displaying information necessary for shooting and the auxiliary display for shooting such as the photometric range mark and the grid of eyes displayed on the focusing screen are configured to overlap each other.

[0003]

However, in the above-mentioned conventional example, since the display member for superimposing and the focusing screen are separate bodies, the focusing screen is replaced in the camera in which the focusing screen is replaceable. At that time, the optical axis centers of the superimpose display member and the focusing screen are misaligned, and if you replace it with a focusing screen with grid lines or a focusing screen with crosshairs with scales, you can replace the grid with the grids with scales or crosshairs with scales. The display shift from the impose display is noticeable, and the display in the viewfinder is very unsightly. Also, it is very difficult to align the optical axis center of the focusing screen with the superimpose display member, and it is necessary to integrally position and hold the focusing screen. Therefore, the focusing screen due to manufacturing errors of the finder optical system and environmental changes (temperature and humidity) Considering the case where the dimensional change occurs, it is extremely difficult to replace the focusing screen. In particular, it is almost impossible for the user of the camera to replace the focusing screen, and for example, there is a drawback that the focusing screen must be replaced at a service station or the like.

[0004]

SUMMARY OF THE INVENTION The present invention is a display device for performing a superimposed display in a viewfinder, and a first display member for performing the superimposed display and a display in the viewfinder. A focusing screen, which is a second display member, a finder optical system including a penta roof prism, the first display member, and a display guide unit that guides the focusing screen, which is the second display member. It has a penta holder that is an optical system holding member that has, and a focusing screen holding member for holding the focusing screen on the penta holder, and the display guide means adjusts the position of a guide portion that guides the focusing screen. With possible display guide adjustment means It is characterized in that.

In the above-mentioned structure, in the camera in which the focusing screen is replaceable, the position of the guide portion for guiding the focusing screen is adjusted by the display guide adjusting means of the display guide means, whereby the superimposing display is performed. Of the optical axis center of the first display member for use with the focusing screen can be prevented, and by adjusting the gap (play amount) between the focusing screen and the guide member to an appropriate play amount, Even if the dimension of the focusing screen changes due to humidity or the like, it is possible to easily and reliably replace the focusing screen.

[0006]

1 to 15 are drawings showing the present invention, FIG. 1 is a view showing a section of an optical system in a camera of the present invention, and FIG. 2 is an enlarged sectional view of a finder optical system in FIG. is there. In the figure, reference numeral 1 is a camera body, and 2 is a semi-transmissive main mirror, which reflects and guides a photographing light flux transmitted through an unillustrated photographing lens to a finder optical system, and a part of the photographing light flux is described later. The light is transmitted to lead to the focus adjustment device 4. Reference numeral 3 denotes a total reflection type sub-mirror for guiding a part of the photographing light flux transmitted through the main mirror 2 to an automatic focus adjusting device 4 which will be described later, 4 denotes an automatic focus adjusting device, and 5 denotes the photographing light flux reflected by the main mirror. It is a focusing screen (second display member in the present invention) for forming an image. The focusing screen 5 is detachable as will be described later, and has a Fresnel lens 5a on the lower surface and a focus image forming surface 5b on the upper surface. On the focus image forming surface 5b.
c, grid lines 510a, graduated crosshairs 520a, and other display marks in the finder field are engraved. Reference numeral 6 denotes a display panel for superimposing (first display plate in the present invention: hereinafter referred to as SI display plate), and a lower surface 6a of the SI display plate 6 is provided with a plurality of fine prisms formed as described later. The range-finding range mark group 6d is displayed, and the range-finding range mark group 6d is projected by the illumination light of the SI-LED 11 described later being projected onto the range-finding range mark group 6d by the SI illumination lens 10. The minute prisms forming the mark group 6d are reflected to make it appear to be lit. Reference numeral 7 denotes a condenser lens for focusing the light flux imaged on the focus image forming surface 5b of the focusing screen 5 upward (an eyepiece optical system including a pentaprism). Reference numeral 8 is a penta roof prism, 9 is an eyepiece lens group incorporating a diopter correction adjustment mechanism (not shown), and is composed of a concave lens 9a, a convex lens 9b, and a flat protective glass 9c. The diopter is adjusted by moving it. Reference numeral 10 is an SI illumination lens for irradiating the SI display plate 6 with light from the SI-LED 11 for display illumination, 11 is an SI-LED for display illumination of the SI display plate 6, and the SI illumination lens 10 is used to The distance measuring mark group 6d on the SI display plate 6 is illuminated. Reference numeral 12 denotes a photometric lens, which re-images the subject image formed on the focus image forming surface 5b of the focusing screen 5 on a photometric sensor 13 described later. A photometric sensor 13 measures the subject image formed by the photometric lens 12. The photometric sensor 13 is a multi-division photometric sensor in which a sensor light receiving unit (not shown) is divided into a plurality of parts. Reference numeral 14a denotes a lower display device for displaying photographing information below the finder field outside the finder field,
Further, as will be described later, a lateral display device 14 for displaying photographing information outside the finder field of view next to the finder field of view.
b (see FIG. 4). Reference numeral 20 denotes a screen holding frame for holding the focusing screen 5, one end of which is rotatably supported about a hinge portion 20a as a rotation center, and the other end of which locks a locking pawl 20b by a pressing spring 40 described later. Has been done. Reference numeral 30 denotes a penta holder which is an optical system holding member, which holds the SI display plate 6 in a replaceable manner, holds the condenser lens 7 and the penta roof prism 8 inside thereof, and also the lower display member 14 and the later-described member. The pressing spring 40 is fixed.

FIG. 3 is an A view of the viewfinder optical system in FIG. 2 as seen from the front of the camera.
It is the figure which looked at from the camera front. In the figure, the pressing spring 40 is made of a thin plate member having a spring property,
A holding frame lock arm portion 41 for locking the lock claw 20b of the screen holding frame 20 and the SI display plate 6
Display plate lock arms 44a, 44 for locking and holding the
b. The holding frame lock arm portion 41 is provided with a lock hole 42 that engages with the lock claw 20b, and the holding frame lock arm portion 41 is provided with a lock release knob portion 43 at the tip thereof. Then, the lock release knob 43 is pulled up in the direction of the paper surface in the figure to deform the holding frame lock arm portion to release the lock hole 42 and the lock claw 20b of the screen holding frame 20 from each other. As a result, the focusing screen 5 can be attached / detached to / from the camera 1. The display plate lock arm portion 44
The a and 44b have locking portions 45a and 4a for engaging with two display plate lock claws 6b of the SI display plate 6 which will be described later.
5b, and the locking portion 45 for engaging with two display plate lock claws 6b of the SI display plate 6 described later.
The tips of a and 45b are bent to the back side of the paper in an L shape. In addition, lock release portions 46a and 46b are provided near the lock portions 45a and 45b, and the lock release portions 46a and 46b are pulled up in the front direction of the paper surface and the display plate lock arm portions 44a and 44b are pulled up. By deforming the locking portion 4
5a, 45b and the two display plate lock claws 6b of the SI display plate 6 are released from each other, and the camera 1 of the SI display plate 6 is released.
It is possible to remove and replace from. In addition, the SI display plate 6
Is positioned on the penta holder 30 by fitting the display plate lock claw 6b and two positioning notches 33 provided on the penta holder 30.

FIGS. 4 and 5 show the above-mentioned SI display plate 6 and focusing screen 5 for performing display in the finder field of the present invention. FIG. 4 shows the SI display plate 6 and the camera 1 as an example. Lower side (lower surface 6a of the SI display plate 6
Side: see FIG. 1, and FIG. 5 shows the focusing screen 5 when the camera 1 is seen from above (the focus image plane 5b side of the focusing screen 5: see FIG. 1). Is. As shown in FIG. 4, a plurality of distance measuring range mark groups 6d formed by minute prisms are formed in the center of the lower surface 6a of the SI display plate 5,
By projecting the illumination light of the SI-LED 11 to the distance measuring range mark group 6d by the SI illumination lens 10, the distance measuring range mark group 6d is turned on by the reflection of the minute prism. In addition, one side of the SI display plate in the longitudinal direction is engaged with the display plate lock arm portions 44a and 44b of the pressing spring 40 fixed to the penta holder 30 to be pressed and the penta holder Three
0 is provided on the display plate lock claw 6b which is positioned on the penta holder 30 by fitting the two positioning notches 33 on the other side and the penta holder 3 on the other side.
It has a hinge claw 6c for engaging with the end surface of the opening of No. 0.

In FIG. 5, on the image forming focal plane 5b of the focusing screen 5, a photometric range mark 5c indicating a range measured by the photometric sensor 13 of the camera 1 is displayed. Reference numeral 5d designates the focusing screen 5 when the focusing screen 5 is attached or detached.
Is an operation knob for holding, and is fixed in the longitudinal direction of the focusing screen 5 (on the front surface of the camera 1, the pressing spring 40 side: see FIG. 1). Reference numeral 5e is a pressing projection for pressing the focusing screen 5 to the lower portion of the penta holder 30 by the screen holding frame 20. The pressing projection 5 has a substantially arc shape toward the Fresnel lens 5a (back side of the drawing) surface of the focusing J screen 5. The projections are installed at both ends of the focusing screen 5, and the screen holding frame 20 pushes the projections 5e.
The focusing screen 5 is pressed against the lower portion of the penta holder 30 by pushing up.

FIG. 6 shows the focusing screen 5 described above.
And the SI display plate 6 is attached to and detached from the penta holder 30. In the figure, when the lock release knob portion 43 of the pressing spring 40 of the penta holder 30 is operated, the lock hole 42 of the pressing spring 40 and the lock claw 20b of the screen holding frame 20 are operated.
Is disengaged, and the screen holding frame 20 rotates counterclockwise around the hinge portion 20a while holding the focusing screen 40. In this state, the operating knob 5d of the focusing screen 5 shown in FIG. 5 is picked up by a tool such as tweezers and taken out from the screen holding frame 20, so that the focusing screen 5 is exchanged (attached / detached). When the focusing screen 5 is removed, the SI display plate 6 can be attached and detached. Unlocking portion 45 of the pressing spring 40
When the a, 45 Tb is raised in front of the camera 1 (pulled up to the front side of the paper in FIG. 3), 2 of the SI display plate 6
The engagement between the display plate lock claws 6b at some places and the locking portions 45a and 45b of the pressing spring 40 is released. When this state is held, the SI display plate 6 is disengaged from the penta holder 30 (indicated by a two-dot broken line in the drawing) while substantially rotating counterclockwise about the hinge claw 6c as a center of rotation. It is possible to replace the plate 6. However, in the present invention, the SI display plate 6 is for displaying the function of the camera (in the present embodiment, the position display of the distance measuring point), and is normally constructed so that the photographer (user) cannot replace it. There is.

The superimposing display of the camera of the present invention is the light-projecting reflection type superimposing display as described above. However, such a liquid crystal display element as the transmissive display described in the conventional example is used. The display element may be arranged in the optical path of the finder of the camera to display a figure or a character on the subject image.

FIG. 7 shows a grid-filled screen 510 and a scaled crosshair screen 520 which are interchangeable focusing screens of the focusing screen 5 in the finder optical system. The grid-filled screen 510 is the focusing screen 5 described above.
In addition to the photometric range mark 5c, a grid pattern 510a is added to the image forming focal plane 5b, and the scaled crosshair screen is formed on the image forming focal plane 5b of the focusing screen 5. In addition to the metering range mark 5c, a scaled crosshair 520a and a peripheral scale 520b are added, and other functions and shapes are the same as those of the focusing screen 5.

8 to 11 show the guide member 50 of the focusing screen 5 which is the display guide means of the present invention.
And the adjustment guide member 60 which is the display guide adjustment means. 8 is a cross-sectional view (cross-section C-C in FIG. 9) of the viewfinder optical system shown in FIGS. 1 and 2 in the front-back direction of the camera along the viewfinder optical axis, and FIG.
FIG. 3 is a view of the finder optical system shown in FIG. 2 as viewed from below, in which two-dot broken line indicates the screen holding frame 20.
Is shown. FIG. 10 shows the guide member 5 in FIG.
0 is an enlarged view, and FIG. 11 is a side cross-sectional view (cross-section BB) of the display guide means including the adjustment guide member 60 in FIG.
Is. In each drawing, the guide member 50 of the focusing screen 5 is formed of a thin plate having a spring property as described above, the upper end thereof is fixed to the side surface of the penta holder 30, and the lower end portion thereof is A guide portion 50a bent in a dogleg shape is provided. An adjusting guide member 60 for guiding the focusing screen 5 and adjusting the position of the focusing screen 5 is formed of an L-shaped thin plate having a spring property, and the spring property of the penta holder 30 makes it possible. It is pressed to the side. Further, the adjustment guide member 60 has a positioning hole 60d and a restriction hole 60e which are fitted respectively to a positioning pin 31 and a restriction pin 32 provided on the back side of the mounting portion 30a of the lateral display device 14b of the penta holder 30. The positioning pin 31 is rotatably held by the eccentricity adjusting dowel 61, which will be described later. The lower end of the adjusting guide member 60 has an adjusting guide portion 60a drawn into a substantially arc shape, and a protrusion that is pressed against the side surface of the penta holder 30 by a spring force in the vicinity of the upper portion of the adjusting guide member 60. Pad 6
0b is formed. Reference numeral 60c is a substantially oval-shaped adjustment hole that is fitted with an eccentricity adjustment portion 61c of an eccentricity adjustment dowel 61 described later. Reference numeral 61 denotes an eccentricity adjusting dowel, and as shown in FIG. 7, the pen tower holder 30 and the adjusting guide member 6 are provided.
0 is pinched by the washer 62 and the crimped foot portion 61b
By caulking the washer 62, the eccentricity adjustment dowel 61 is rotatably held. Reference numeral 61a is a dowel adjusting portion having a cross-shaped slit for rotating the eccentricity adjusting dowel 61, and 61b is the above-mentioned crimp foot portion. Reference numeral 61c denotes an eccentricity adjusting portion, which has a cylindrical shape having a center at a position shifted with respect to a rotation center of the eccentricity adjusting dowel 61,
As described above, the adjustment hole 6 of the adjustment guide member 60.
Since the eccentricity adjusting dowel 61 is rotated, the eccentricity adjusting portion 61c causes the adjustment guide member 6 to rotate.
The adjustment guide member 60 is rotated about the positioning pin 31 by eccentrically sliding in the zero adjustment hole 60c.

12 to 15 are enlarged operational views of the adjusting guide member in FIGS. 8 and 9. When the eccentricity adjustment dowel 61 of the adjustment guide member 60 is rotated counterclockwise, the adjustment guide member 60 is rotated about the positioning pin 31 of the penta holder 30 as shown in FIGS. Rotate clockwise. As the adjustment guide member 60 rotates counterclockwise, the substantially arc-shaped drawn adjustment guide portion 60a formed at the lower end portion of the adjustment guide member 60 has the abutting portion 60b.
With the fulcrum as a fulcrum, the focusing screen 5 is moved in a direction in which a gap is opened (see FIG. 12). Further, when the eccentricity adjusting dowel 61 of the adjusting guide member 60 is rotated clockwise, the adjusting guide member 60 rotates about the positioning pin 31 of the penta holder 30 as shown in FIGS. 14 and 15. Rotate clockwise. As the adjustment guide member 60 rotates in the clockwise direction, a substantially arc-shaped drawn adjustment guide portion 60a formed at the lower end of the adjustment guide member 60 is formed of a thin plate having a spring property. Since it is pressed against the side surface of the penta holder 30 by its spring force, the focusing screen 5 is moved with the abutting portion 60b as a fulcrum.
On the other hand, it moves in the direction in which the gap is closed (the direction in which the focusing screen 5 is pushed) (see FIG. 14). In this way, by rotating the eccentricity adjustment dowel 61, the gap between the adjustment guide portion 60a of the adjustment guide member 60 and the focusing screen 5 is adjusted.

The guide member 50 has a small gap between the focusing screen 5 and the guide portion 50a (contact portion with the focusing screen 5) when the focusing screen 5 is located at the center of the finder optical axis. It is set to have (about 0.03 mm) and is fixed to the penta holder 30. In addition, in the state described above, the amount of rattling of the focusing screen 5 of the adjustment guide portion 60a of the adjustment guide member 60 is about 0.08 mm (gap 0.03 mm of the guide portion 50a + the adjustment guide portion 60).
The gap adjustment amount of a is 0.05 mm).
This is because the focusing screen 5 is made of an acrylic material, so expansion and contraction of about 50 μm can be considered due to changes in temperature and humidity (especially at high humidity).
For example, even if the focusing screen 5 is expanded by about 50 μm due to humidity, the focusing screen 5 is not sandwiched between the guide member 50a and the adjustment guide member 60a, and is set so that the focusing screen 5 can be smoothly attached and detached even when the focusing screen 5 is replaced. The amount of rattling.

As described above, it is assumed that the SI display plate 6 cannot be replaced by the photographer (user). Therefore, the SI display plate 6 is pressed against the penta holder 30 in the front-rear direction of the camera by the pressing spring 40 toward the hinge portion 20a side of the screen holding frame 20 of the penta holder 30, and in the left-right direction of the camera. On the other hand, since it is positioned with a very small gap,
The amount of deviation of the center of the SI display plate 6 from the center of the finder optical axis can be suppressed with an extremely small amount. However, normally, the focusing screen 5 is shown in FIG.
As shown in, it is configured to be exchangeable by the photographer (user). In such a structure, the focusing screen 5 has the screen holding frame 2
In order to improve the attachment / detachment operability with respect to 0, a large amount of gap is set and held to some extent. For example, if the focusing screen 5 is attached and detached without the guide member 50 and the adjustment guide member 60,
The focusing screen 5 is the screen holding frame 2
A displacement due to mounting occurs between the finder optical axis (or the center of the SI display plate 6) and the center of the focusing screen 5 by the amount of the set gap of 0. Especially, when the grid-filled screen 510a and the scaled crosshair screen 520a, which are exchange focusing screens as shown in FIG. 7, are exchanged and attached, the displacement between the SI display plate 6 and the focusing screen 5 becomes noticeable. .

According to the present invention, when the focusing screen 5 is mounted as shown in FIG. 6, the focusing screen 5 is mounted on the screen holding frame 20 due to the mounting displacement of the focusing screen 5 in the front-rear direction of the camera. When the focusing screen 5 is pushed up against the hinge portion 20a of the screen holding frame 20 when the focusing screen 5 is pushed up and set in the penta holder 30, there is a play amount in the mounting displacement of the focusing screen 5 in the front-back direction. Can be offset and can be made extremely small easily.

Further, the mounting displacement of the focusing screen 5 in the left and right direction of the camera is increased by pushing the guide member 50 to the penta holder 30 while rotating the focusing screen 5 as shown in FIG.
Guide portion 50a formed in a dogleg shape at the lower tip end of the adjustment guide portion 60 and the adjustment guide portion 60 formed in the substantially arc shape formed at the lower tip end portion of the adjustment guide member 60.
The end surface of the focusing screen 5 is gradually guided by a, and the focusing screen 5 is mounted while being positioned with respect to the optical axis of the finder (or the SI display plate 6). In the state where the focusing screen 5 is attached to the penta holder 30, the focusing screen 5 is moved by the screen holding frame 20.
Since it is pressed against the penta holder 30, the focusing screen 5 will not be displaced after mounting.

[0019]

As described above, the present invention is a display device in a viewfinder of a camera, which includes a first display member for displaying in the viewfinder field and the first display member in the viewfinder field. A second display member for overlapping display, an optical system holding member for positioning and holding the finder optical system and the first display member, and having display guide means for guiding the second display member; A display holding member for holding the second display member on the optical system holding member, wherein the display guide means is a display guide adjustment capable of adjusting the position of a guide portion for guiding the second display member. By providing the means, even in a camera capable of superimposing display in the viewfinder, a display member and a focus for superimposing display are provided. It is possible to prevent display deviation of the display on the superimpose display and focusing screen by preventing displacement of grayed screen of the optical axis (display) center.

Further, the guide member of the focusing screen guides as the focusing screen is mounted and set, and the position of the focusing screen is adjusted so that the clearance (play amount) between the focusing screen and the guide member can be adjusted to an appropriate amount. It is possible to adjust, and even if the size of the focusing screen changes due to temperature, humidity, etc., the display deviation between the superimpose display and the display on the focusing screen can be adjusted easily and reliably, and the focusing screen can be easily replaced. This allows the user to replace the focusing screen.

[Brief description of drawings]

FIG. 1 is a sectional view of an optical system of a camera of the present invention.

FIG. 2 is an enlarged sectional view of the finder optical system shown in FIG.

FIG. 3 is a front view (view A) of the finder optical system of FIG.

FIG. 4 is a diagram for explaining an SI display board for performing a superimposed display according to the present invention.

FIG. 5 is a diagram illustrating a focusing screen of the present invention.

FIG. 6 is a diagram for explaining how to attach and detach the SI display plate and the focusing screen.

FIG. 7 is a diagram illustrating an exchange focusing screen of the present invention.

8 is a cross-sectional view of the viewfinder optical system of FIG. 2 in the front-back direction of the camera along the viewfinder optical axis (cross-section CC of FIG. 9).

FIG. 9 is a view of the viewfinder optical system of FIG. 2 seen from the lower side of the camera.

FIG. 10 is an enlarged cross-sectional view of the guide member of the present invention.

FIG. 11 is a side sectional view of the adjustment guide member of the present invention (FIG. 9).
Cross section BB)

FIG. 12 is an enlarged sectional view of the adjustment guide of the present invention for explaining the operation.

FIG. 13 is an enlarged sectional view of the adjustment guide of the present invention, illustrating the operation.

FIG. 14 is a view for explaining the operation in the enlarged sectional view of the adjustment guide of the present invention.

FIG. 15 is an enlarged sectional view of the adjustment guide of the present invention for explaining the operation.

[Explanation of symbols]

 1 Camera Main Body 2 Main Mirror 3 Sub Mirror 4 Automatic Focus Adjustment Device 5 Focusing Screen 6 SI Display Plate 7 Condenser Lens 8 Penta Holder 9 Eyepiece Group 10 SI Illumination Lens 11 SI-LED 12 Photometric Lens 13 Photometric Sensor 14a Finder Lower Display Device 14b Horizontal viewfinder display device 20 Screen holding frame 30 Penta holder 40 Holding spring 50 Guide member 60 Adjustment guide member 510 Grid-containing focusing screen 520 Cross-shaped focusing screen with scale

Claims (1)

[Claims] 1. A display device in a viewfinder of a camera, wherein a first display member for displaying in a viewfinder field and a second display for displaying an overlap with the first display in the viewfinder field. A member, an optical system holding member for positioning and holding the finder optical system and the first display member, and a display guide unit for guiding the second display member, and the second display member for holding the optical system in the optical system. A display holding member for holding the member, the display guide means,
A viewfinder device for a camera, comprising: a display guide adjusting unit capable of adjusting a position of a guide portion that guides the second display member.