JPH0926618A - Display device in finder screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which can be applied to a camera provided with a photographing optical system and a finder optical system independently and a reversing optical system including a prism, in the finder optical system, especially and displays information for suggesting photographing conditions such as a deviation in a photographing region in a finder screen, therein, as necessary. SOLUTION: A display light source 13 emitting light source light, to display the information in the finder screen and a luminous flux regulating mask 14 are disposed outside the second surface 7b of a pentagonal prism 7. At this time, the mask 14 is set in the range of the movement of a surface optically equivalent to an image forming surface by an objective optical system 5 moved in accordance with an object distance and the display light source 13 and the mask 14 are oriented to make the light from the light source obliquely incident on the second surface 7b of the pentagonal prism 7. The lighting and turning off of the display light source 13 are controlled according to the photographing conditions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finder image obtained by a finder optical system having a reversing optical system including a prism mounted on a camera body independently of a photographing optical system, and a light source image is superimposed on a subject image in a finder screen. The present invention relates to a viewfinder screen display device that displays information indicating a shooting situation such as a shift of a shooting range in a viewfinder screen, a shooting mode, and brightness of a subject by displaying the information.

[0002]

2. Description of the Related Art Generally, in a camera having a photographing optical system and a viewfinder optical system independently, as shown in FIG.
A so-called parallax phenomenon occurs in which the photographing range 34 actually photographed by the photographing optical system 31 is displaced with respect to the finder screen 33 viewed through the finder optical system 32. This shift amount is usually set to be small when the shooting distance from the camera to the subject is medium or long, and increase as the shooting distance becomes shorter.

A prism is generally used in the reversing optical system of the finder optical system in order to keep this amount of displacement small over the entire shooting distance range and to make the finder optical system compact. Since a parallax cannot be completely eliminated by a camera having an independent finder optical system and a finder optical system, as shown in FIG. 21, a parallax correction mark 35 indicating the shooting range in the case of short-distance shooting is displayed in the finder screen 33. Many are displayed.

[0004]

However, in the above conventional camera, the viewfinder screen 3 shown in FIG.
Since the parallax correction mark 35 in 3 is always displayed, it is annoying when the shooting distance is medium or long and unnecessary, and when the camera is equipped with a macro shooting mechanism, macro shooting is performed. Since the parallax corresponding to the mode becomes very large, there is a problem that the display position of the parallax correction mark 35 is near the center of the finder screen 33 and there is a feeling of strangeness.

Further, as a photographing situation that it is desired to suggest to the user by displaying information such as a parallax correction mark on the viewfinder screen, the photographing mode other than the deviation of the photographing area on the viewfinder screen There is the brightness of the subject, etc., but in the above conventional cameras, especially in the type of camera that includes a prism in the inverting optical system of the finder optical system, information indicating these shooting conditions should be displayed on the finder screen. Nothing was constructed.

The present invention has been made in view of the above-mentioned problems, and is applied to a camera having a taking optical system and a finder optical system independently, and particularly having a reversing optical system including a prism in the finder optical system. It is an object of the present invention to provide a viewfinder in-screen display device that displays information indicating a shooting condition such as a shift of a shooting range on the viewfinder screen, a shooting mode, and brightness of an object on the viewfinder screen as needed. To aim.

[0007]

In order to achieve the above object, according to the present invention, a finder having an objective optical system, an inversion optical system including a prism, and an eyepiece optical system which is mounted on a camera body independently of a photographing optical system. In a viewfinder screen display device that displays information in a viewfinder screen obtained by an optical system, that information is information that suggests the shooting situation, and in order to display that information, light source light is emitted and the light source light is a prism. After being obliquely incident on one surface, a light source is displayed in the viewfinder screen as a light source image superimposed on the subject image, and control means for controlling lighting / non-lighting of the light source according to the shooting situation. .

Further, a mask for regulating the luminous flux is provided on the optical path of the light from the light source to the one surface of the prism and has an opening of a predetermined shape.

Further, the mask is formed and set so that the visual distance is uniform when reaching the eye point from each point on the periphery of the opening to one surface of the prism through the prism and the eyepiece optical system. I am supposed to.

As a concrete construction, the mask has a semi-cylindrical outer shape, a circular hole is provided as an opening in the side surface of the semi-cylindrical shape, and the axis of the semi-cylindrical shape is It is assumed that the prism is arranged at a predetermined angle with respect to the surface perpendicular to the optical axis of the light source from the light source to the one surface of the prism so as to eliminate the diopter difference between the left and right openings.

Further, the mask has a moving range of a plane optically equivalent to an image plane formed by the objective optical system of the finder optical system which moves according to the photographing distance on the optical path of the light source light from the light source to one surface of the prism. It is arranged inside.

Further, the photographing condition is set such that the photographing range shifts from the viewfinder screen according to the photographing distance, and the light source is turned on to indicate the position of the photographing range when the near photographing distance is large. To do so.

Further, the photographing condition may be a photographing mode set by the user using a photographing mode setting member provided on the camera body.

Further, the photographing condition may be the brightness of the subject, and the control device may control the light source to be turned on or blinking when the exposure to be changed corresponding to the brightness is out of the preset interlocking range. Good.

Therefore, in the present invention, the photographing situation is suggested in the finder screen of the camera provided with the finder optical system having the objective optical system, the reversing optical system including the prism, and the eyepiece optical system independently of the photographing optical system. The information is displayed as a light source image superimposed on the subject image according to the shooting situation. Moreover, the viewfinder optical system is also used as it is as an optical system for displaying the light source image in the viewfinder screen.

Further, in a device provided with a light flux regulating mask which is arranged on the optical path of the light source light from the light source to one surface of the prism and has an opening of a predetermined shape, the shape of the opening of the mask is displayed in the viewfinder screen. It becomes the shape of the light source image.

Further, the mask is formed and set so that the visual distance is uniform when reaching the eye point from each point on the periphery of the opening to one surface of the prism through the prism and the eyepiece optical system. In this case, the diopter is the same at each part of the contour of the light source image displayed in the viewfinder screen.

Further, the mask has a semi-cylindrical outer shape, and a circular hole is provided as an opening in the side surface of the semi-cylindrical shape, and the axis of the semi-cylindrical shape is from the light source to one surface of the prism. By arranging at a predetermined angle so as to eliminate the diopter difference between the left and right of the opening with respect to the plane perpendicular to the optical axis of the source light reaching up, the eye point can be obtained from each point around the opening of the mask with a simple configuration. It is possible to uniformly set the viewing distance when reaching.

Further, in the optical path of the light source light from the light source to the one surface of the prism, the mask moves in accordance with the photographing distance, and the moving range of the surface optically equivalent to the image forming surface of the objective optical system of the finder optical system. When it is arranged inside, the diopter of the subject image and the diopter of the contour of the light source image become substantially equal in the viewfinder screen.

Furthermore, the photographing condition is set such that the photographing range shifts from the viewfinder screen according to the photographing distance, and the light source is turned on to indicate the position of the photographing range when the near photographing distance is large. With this,
When the deviation is large and parallax correction is required, the position of the shooting range in the viewfinder screen is displayed.

Further, in the case where the photographing condition is the photographing mode set by the user using the photographing mode setting member provided in the camera body, for example, by setting the macro photographing mode for performing close-up photographing, When the shift of the shooting range in the viewfinder screen becomes large and parallax correction is required, the position of the shooting range in the viewfinder screen can be displayed.

Further, in the case where the photographing condition is the brightness of the subject, and the control device controls the light source to be turned on or blinking when the exposure to be changed corresponding to the brightness is out of the preset interlocking range, When the shutter speed or aperture is changed to the limit of the variable range and the proper exposure corresponding to the brightness of the subject is not obtained, the user is notified of that fact.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a finder screen display device according to the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a camera equipped with the finder screen display device according to the first embodiment. This camera is equipped with a photographing optical system 1 and a finder optical system 2 independently, and is also equipped with a distance measuring optical system 3 and a flash 4. Further, in this camera, it is possible to switch between the normal shooting mode and the macro shooting mode by using a shooting mode setting member (not shown).

FIG. 2 is a top view showing the finder optical system 2 of the camera shown in FIG. The finder optical system 2 includes an objective optical system 1 including an objective lens group and an inverting optical system 8 including a roof prism 6 and a penta prism 7.
And an eyepiece lens 9. The light flux from the subject is converged by the objective optical system 5, the direction of the optical path is changed by the roof prism 6, and the light is turned upside down.
An image is once formed in the vicinity of the first surface 7a of the pentaprism 7.
The image plane formed by the objective optical system 5 slightly moves in the optical axis direction according to the photographing distance set as the distance to the subject.

The second surface 7b of the pentaprism 7 is a semi-transmissive surface on which metal is vapor-deposited, and is configured to allow a part of the light flux from the subject to pass therethrough and guide it to the photometric lens 11 and the photometric element 12. . Further, the rest of the light flux from the subject is reflected by the second surface 7b of the pentaprism 7, and further the third surface 7c.
After passing through the fourth surface 7d and exiting from the pentaprism 7, the light passes through the eyepiece 9 and reaches the eyepoint 10.

On the outside of the second surface 7b of the pentaprism 7, a display light source 13 for emitting a light source light displayed as a light source image in the finder screen and a mask 14 having a light flux regulating opening are also arranged. There is. And the mask 14
Is set within a moving range of a plane optically equivalent to the image plane formed by the objective optical system 5 that moves according to the shooting distance.

Here, the display light source 13 and the mask 14 are
The optical axis of the light source light incident on the second surface 7b of the pentaprism 7 formed by these is aligned so as to be substantially parallel to the optical axis of the light flux from the subject on the optical path from the second surface 7b to the eyepoint 10. To be done. In this case, if the conventional finder optical system 2 is used as it is, the light source light generally enters the second surface 7b of the pentaprism 7 obliquely.

That is, FIG. 3 shows a conceptual diagram of the optical system from the mask 14 to the eye point 10 when the pentaprism 7 is replaced with a straight model. As shown in FIG. Since the surface 7b is formed obliquely, in order to allow the light source light to enter the second surface 7b and be refracted, the light travels substantially parallel to the optical axis.
The light from the light source is obliquely incident on the second surface 7b. For this reason, as will be described later, when the light source light is displayed as a light source image in the finder screen, it is necessary to take measures to prevent a diopter difference from occurring depending on the contour portion of the light source image.

As a method of avoiding the oblique incidence of the light from the light source, for example, when the penta prism 7 is replaced with a straight model in FIG.
As shown in the conceptual diagrams of the optical system up to the above, a wedge prism 15 having a shape that forms a surface 15a perpendicular to the optical axis of the pentaprism 7 as an incident surface of the light source light can be added to the pentaprism 7. FIG. 5 shows an actual configuration corresponding to FIG.

However, in this case, since the wedge prism 15 takes a space, the arrangement of the photometric lens 11 and the photometric element 12 in FIG. 2 is hindered, and in addition to the configuration of the conventional reversing optical system 8, the wedge-shaped prism 15 is used. There is a problem that the prism 15 is required and the cost is increased. Therefore, in the first embodiment, as shown in FIGS. 2 and 3, the light source light is obliquely incident on the second surface 7b of the pentaprism 7.

FIG. 6 shows a state in which the light source image 17 is displayed in the finder screen 16 with this configuration.
In the first embodiment, when the shooting distance is short and the shift of the shooting range 18 in the finder screen 16 is large, that is, when parallax correction is necessary, the light source image 17 is located at a position almost at the center of the shooting range 18. Is displayed. The visibility of the light source image 17 can be improved by increasing the brightness. In order to adjust the position of the light source image 17 in the viewfinder screen 16, the positions of the display light source 13 and the mask 14 in FIG. 2 may be finely adjusted in a plane perpendicular to the optical axis of the light source light.

Here, as the mask 14, FIG.
As shown in the top view and the side view in (b), it is convenient to use a flat plate having a circular opening 14a. In this case, in this embodiment, the light source light is transmitted to the pentaprism 7. Since the light is obliquely incident on the second surface 7b, the diopter varies depending on the contour portion of the light source image 17 displayed in the finder screen 16 for the reason described later. FIG. 8 shows an example of diopter at each part of the contour of the light source image 17 when the mask 14 having the shape shown in FIG. 7 is used. The vertical and horizontal directions of the light source image 17 in the figure are the same as those of the light source image 17 displayed in the finder screen 16 in FIG.

Therefore, when the eyes are adjusted so that the left and right ends of the light source image 17 can be clearly seen when looking through the viewfinder screen 16, the upper and lower ends of the light source image 17 are blurred or blurred as shown in FIG. It will be visible in the state of
On the contrary, when the eyes are adjusted so that the upper and lower ends of the light source image 17 can be clearly seen, the left and right ends of the light source image 17 are not clearly visible as shown in FIG.

The phenomenon that a diopter difference occurs in each part of the contour of the light source image 17 occurs for the following reason. In contrast to the actual light source light, FIG. 11 and FIG.
Rays that are emitted from 0, pass through the eyepiece lens that is a convex lens, and enter the pentaprism 7 from the fourth surface 7d that is perpendicular to the optical axis. It shows how to converge in a vertical direction) and a direction horizontal to the paper surface (hereinafter referred to as a horizontal direction).

As shown in FIG. 11, the light flux in the vertical direction forms an image at one point on the best image plane 20 over the entire range where the light flux spreads. On the other hand, as shown in FIG. 12, the second surface 7b of the pentagonal prism 7 is arranged obliquely with respect to the optical axis of the light flux in the left-right direction, so that the light flux in the left-right direction is near the best image plane 20 '. Aberration occurs when forming an image. In addition, the distance D between the second surface 7b and the best image surface 20 in the vertical direction
And the distance D ′ between the point where the optical axis of the light flux in the left-right direction passes through the second surface 7b and the best image plane 20 ′,
There is a relationship of D> D '.

That is, when tracing is performed assuming that a light ray is emitted from the eyepoint 10, the light flux in the vertical direction is imaged farther than the light flux in the horizontal direction. Therefore, as shown in FIG. 7, the opening 14a is formed in a flat plate shape.
When the mask 14 subjected to the treatment is arranged in the vicinity of the best image plane 20 or 20 ′, the mask 1 is emitted from the display light source 13.
Consider the ray that passes through 4 and reaches eyepoint 10,
The left and right lines formed by the vertical beam of light, that is, the upper and lower ends of the light source image 17 should appear closer than the vertical lines formed by the horizontal beam of light, that is, the left and right ends of the light source image 17. become. As a result, as described above, a diopter difference occurs at each part of the contour of the light source image 17.

In order to cope with such a problem, in the first embodiment, as the mask 14, as shown in FIG.
A semicylindrical side surface having a circular hole as the opening 14a is used. As a result, the diopter difference between the upper and lower ends of the light source image 17 and the left and right ends can be eliminated. At the same time, in order to make the right and left ends of the light source image 17 have the same diopter, the semi-cylindrical axis of the mask 14 is perpendicular to the optical axis of the light source from the light source 13 to the second surface 7b of the pentaprism 7. It is oriented at a predetermined angle with respect to the plane.

By forming and setting the mask 14 in this manner, it is possible to set a uniform visual distance when the eye point 10 is reached from each point on the periphery of the opening 14a of the mask 14 with a simple structure. As shown in an example in FIG. 14, the diopter can be made equal at each part of the contour of the light source image 17. It should be noted that what is visible as the outline of the light source image 17 is actually the shape of the opening 14 a of the mask 14. Therefore, by setting the shape of the opening 14a of the mask 14 to the desired shape of the light source image 17, the shape of the light source image 17 can be made arbitrary.

Further, as described above, the mask 14 is
Since it is set within the moving range of the plane optically equivalent to the image plane formed by the objective optical system 5 that moves according to the shooting distance,
Since the diopter of the subject image and the diopter of the contour of the light source image 17 are substantially equal in the finder screen 17, when the eyes are adjusted so that one of the contours of the subject image and the light source image 17 can be clearly seen, At the same time, the other is clearly visible.

FIG. 15 is a control block diagram showing the overall configuration of a camera equipped with the finder screen display device of the first embodiment. Information regarding the brightness of the subject within the range corresponding to the finder screen 16 is provided to the control means 21 from the photometric means 22 including the photometric element 12 and the like.
The distance measuring means 23 including information about the photographing distance, the photographing optical system position detecting means 24 regarding the photographing optical system position, the photographing mode setting member 25 regarding the photographing mode, and the shutter button. A release signal is input from the release member 26 provided.

Then, the control means 21 controls the output of the photographing optical system driving means 27 and the display light source driving means 28 based on the inputted information and signals. In this case, the photographing optical system 1 uses the photographing optical system driving unit 27 and the photographing optical system position detecting unit 24 so that the photographing optical system 1 is focused according to the photographing distance obtained based on the information from the distance measuring unit 23. The position is feedback controlled. Further, the display light source 13 is turned on / off through the display light source driving means 28.
Flashing is controlled.

FIG. 16 is a flow chart showing how the display light source 13 (denoted by LED in the drawing) is controlled to be turned on / off / blinking in the first embodiment. First, in step # 10, when the user half-presses the shutter button to turn on the first release switch, the control means 21 causes the photometric means 22 to control the brightness of the subject within the range corresponding to the viewfinder screen 16 in step # 20. Measurement, that is, photometry is performed, and in step # 30, the distance measuring means 23 measures the photographing distance D, that is, distance measurement. Next, in step # 40, if it is determined that if the shooting distance D is shorter than this, it is equal to or greater than the distance D1 that requires parallax correction, the process proceeds to step # 80 to turn off the display light source 13, and If it is determined that the shooting distance D is less than the distance D1, the process proceeds to step # 50.

Further, if it is determined in step # 50 that the shooting distance D is less than the shortest shooting distance Dmin at which focus cannot be achieved, the process proceeds to step # 60 to blink the display light source 13. If the shooting distance D is equal to or more than the shortest shooting distance Dmin, the process proceeds to step # 70 to display the shooting area 18 at a position almost in the center of the shooting area 18 in the finder screen 16. By turning on the light source 13, the necessity of parallax correction and the position of the photographing area are displayed.

After proceeding to steps # 60, # 70, and # 80, in step # 90, when the user fully presses the shutter button to turn on the second release switch, the shutter is released in step # 100 to take a picture. Is performed, and the display light source 13 is turned off in step # 110,
At step # 120, all steps are completed. As described above, when the parallax correction is not necessary, the light source image 17 is not displayed by turning off the display light source 13, so that the parallax correction mark is always displayed in the conventional viewfinder screen 16. It doesn't.

In actual photographing, first, the finder screen 16 is adjusted to a desired photographing range. When the shutter button is pressed halfway down, the distance measurement optical system 3 separately provided in the camera body causes the shooting distance to the subject overlapping the AF (autofocus) frame 19 provided at the center of the finder screen 16. The measurement is performed, and the photographing optical system 1 is automatically adjusted so as to be in focus according to the photographing distance.

At this time, if the shooting distance is shorter than a predetermined value and parallax correction is necessary, the light source image 17 is displayed. Only when the light source image 17 is displayed, the user shakes the camera so that the light source image 17 is aligned with the subject overlapping the AF frame 19, and then fully presses the shutter button to perform parallax correction. Depending on the, you can definitely shoot with parallax correction. Therefore, this photographing method is simpler than the conventional method of confirming the photographing range by alternately viewing parallax correction marks in the vertical and horizontal directions.

Next, a second embodiment will be described. FIG.
6 is a flowchart showing how the display light source 13 (denoted as an LED in the drawing) is controlled to be turned on / off / blinking in the present embodiment. Note that FIGS. 1, 2, 6, and 13 to 15 are also used in common with the first embodiment, but the description thereof will be omitted. In the present embodiment, by setting the macro shooting mode for performing close-up shooting, when the shift of the shooting range 18 in the viewfinder screen 16 becomes large and parallax correction is required, the shooting range 18 in the viewfinder screen 16 is changed. I am trying to display the position.

In FIG. 17, steps # 210 to # 2.
Step 30 is the same as steps # 10 to # 30 of FIG. 16 used in the description of the first embodiment. In the second embodiment, if it is determined in step # 240 that the macro photography mode is set after performing photometry and distance measurement, step # 250
If not, the process proceeds to step # 260.

If it is determined at step # 250 that the shooting distance D is equal to or greater than the shortest shooting distance Dmin1 for focusing in the macro shooting mode, the process proceeds to step # 270 to display the light source for display. 13 is turned on and the display light source 13 is turned on at a position in the finder screen 16 that is substantially at the center of the shooting area 18, thereby indicating that parallax correction is necessary and the position of the shooting area. On the other hand, if it is determined in step # 250 that the shooting distance D is less than the shortest shooting distance Dmin1, the process proceeds to step # 280, where the display light source 13 blinks to call the user's attention.

If it is determined in step # 260 that the shooting distance D is equal to or more than the shortest shooting distance Dmin2 for focusing in a normal shooting mode other than the macro shooting mode, the process proceeds to step # 290. When the shooting distance D is less than the shortest shooting distance Dmin2 by turning off the display light source 13 (since the parallax correction is not necessary) so that the shooting can be performed without the parallax correction, the process proceeds to step # 280 to display. The light source 13 for flashing is blinked to call the user's attention.

Steps # 270, # 280 or # 2
After proceeding to 90, step # 30 in each case
The process proceeds to 0, and the following steps up to step # 330 follow the same flow as steps # 90 to # 120 in the case of the first embodiment shown in FIG. The actual shooting method using the finder screen display device according to the second embodiment is the same as in the first embodiment.

Next, a third embodiment will be described with reference to FIGS. 18 and 19. Note that FIG. 1, FIG. 2, and FIG.
5 is also used in common with the first embodiment, but its description is omitted.

FIG. 18 shows a state in which the first and second light source images 17a and 17b are displayed in the finder screen 16 by the finder screen display device according to the third embodiment. In the present embodiment, in order to correct the shift amount of the shooting range more accurately, the shooting distance is divided into five ranges according to the shooting mode, and the first and second shooting distances are set for medium to long distances.
Neither the second light source images 17a and 17b are displayed, only the first light source image 17a is displayed at a short distance, only the second light source image 17b is displayed at a very close distance, and when the shortest shooting distance or the longest shooting distance. If it exceeds, the control is performed so that both the first and second light source images 17a and 17b blink. In the figure, reference numerals 18a and 18b denote shooting ranges when the shooting distance is a short distance and a close distance, respectively.

Therefore, in the third embodiment, although not shown in the drawing, the first and second light source images 17a and 17b are displayed at positions substantially corresponding to the centers of the photographing ranges 18a and 18b at the short distance and the close distance, respectively. As a display light source corresponding to each of the above, two of the first and second display light sources are provided.
Are provided at predetermined positions, and two openings of the mask 14 are also provided at predetermined positions.

In FIG. 19, the first display light source (denoted as LED1 in the figure) and the second display light source (denoted as LED2 in the figure) are turned on / off / blinking control in the third embodiment. It is a flowchart which shows a mode that is performed. In the figure, steps # 410 to # 430 are the same as steps # 10 to # 30 of FIG. 16 used in the description of the first embodiment. In the present embodiment, after performing photometry and distance measurement, if it is determined in step # 440 that the macro photography mode is set, the process proceeds to step # 450, and if not, the process proceeds to step # 460.

If step # 450 is reached here,
Shortest shooting distance Dmin, closest shooting distance D1, near shooting distance D
2. As the longest shooting distance Dmax, the respective values Dmin1, D11, D21, Dmax1 corresponding to the macro shooting mode are read. Here, the shortest shooting distance Dmin, the close-up shooting distance D1, the close-up shooting distance D2, and the longest shooting distance Dmax are the distances in which the focus cannot be adjusted when the shooting distance D is shorter than that, respectively.
If the shooting distance D is longer than min and the shooting distance D is shorter than that, the second
When the display position of the light source image 17b is approximately the center of the shooting range, and the shooting distance D is longer than D1 and shorter than that, the display position of the first light source image 17a is the center of the shooting range. If the shooting distance D is longer than that, the distance cannot be focused.

On the other hand, when the process proceeds to step # 460,
Shortest shooting distance Dmin, closest shooting distance D1, near shooting distance D
2. As the longest shooting distance Dmax, the respective values Dmin2, D12, D22 and ∞ (infinity) corresponding to the normal shooting mode are read.

Next, when it is determined in step # 470 that the shooting distance D is less than the shortest shooting distance Dmin, the focus cannot be adjusted, so the routine proceeds to step # 510 and the first step is performed.
Both the display light source and the second display light source are blinked to call the user's attention. On the other hand, when it is determined that the shooting distance D is the shortest shooting distance Dmin or more, step # 4.
Go to 80.

If it is determined in step # 480 that the shooting distance D is less than the closest shooting distance D1,
In FIG. 18, since the photographing range is shifted to the position of 18b, the process proceeds to step # 520 to turn off the first display light source and turn on the second display light source to display only the second light source image 17b. To do. On the other hand, step # 4
If it is determined at 80 that the shooting distance D is greater than or equal to the closest shooting distance D1, the process proceeds to step # 490.

When it is determined in step # 490 that the shooting distance D is less than the near shooting distance D2, the shooting range has shifted to the position 18a in FIG. 18, so the flow proceeds to step # 530. Only the first light source image 17a is displayed by turning on the first display light source and turning off the second display light source. On the other hand, step # 49
When it is determined that the shooting distance D is equal to or more than the near shooting distance D2 at 0, the process proceeds to step # 500.

Further, if it is determined in step # 500 that the shooting distance D is less than or equal to the maximum shooting distance Dmax, parallax correction is not necessary, so step # 54.
In step 0, both the first and second display light sources are turned off. On the other hand, in step # 500, the shooting distance D is the longest shooting distance Dma.
If it is determined that the value exceeds x, the focus cannot be adjusted, and therefore the process proceeds to step # 550 to blink the first and second display light sources to alert the user.

Steps # 510, # 520, # 530,
After proceeding to # 540 or # 550, the procedure proceeds to step # 560 in each case, and then to step # 590.
Up to this, the same flow as steps # 90 to # 120 in the case of the first embodiment shown in FIG. 16 is followed. However, since the third embodiment has two display light sources, the reason why the display light source is turned off in step # 110 of FIG.
In step # 580 of FIG. 19, the first and second display light sources are turned off. The actual shooting method using the finder screen display device according to the third embodiment is the same as in the first and second embodiments.

As described above, as the finder screen display device according to the first to third embodiments, the structure for displaying the position of the shooting range in the finder screen for parallax correction which occurs according to the shooting distance or the shooting mode has been described. However, the present invention is not limited to this, and when the exposure that changes according to the brightness of the subject deviates from the preset interlocking range (that is, even if the shutter speed or the aperture is changed to the limit of the variable range, When the proper exposure corresponding to the brightness is not obtained), the light source image is turned on or blinks to warn the user, or when the film loading error occurs, the light source image is turned on or blinks to the user. It can also be used as a configuration for transmitting that effect.

In that case, if the shape, color, and display position of the light source image are changed according to the type of information to be transmitted to the user, a large amount of information can be transmitted at one time without being mistaken by the user. It will be possible.

[0065]

As described above, according to the first aspect of the invention, the camera is provided with the finder optical system having the objective optical system, the reversing optical system including the prism, and the eyepiece optical system independently of the photographing optical system. In the above, since the information indicating the shooting condition is displayed as a light source image superimposed on the subject image in the viewfinder screen according to the shooting condition, the user is required to shoot without taking his or her eyes off the viewfinder screen. Information can be surely obtained. Moreover, since the finder optical system is also used as it is as an optical system for displaying the light source image in the finder screen, it is not necessary to separately add an optical member for displaying the light source image.

According to the second aspect, since the shape of the opening of the mask is the shape of the light source image displayed in the viewfinder screen, if the shape of the opening of the mask is the shape of the desired light source image, the light source image is It can have any shape.

According to the third aspect, since the diopter is the same in each part of the outline of the light source image displayed in the viewfinder screen, the outline of the light source image is not blurred or blurred depending on the part, and is clear. appear.

According to the present invention, the visual distance when reaching the eye point from each point on the periphery of the opening of the mask is made uniform so that the outline of the light source image displayed in the finder screen can be clearly seen. The configuration for setting to becomes simple.

According to the fifth aspect, since the diopter of the subject image and the diopter of the contour of the light source image are substantially equal in the viewfinder screen, one of the contours of the subject image and the light source image can be seen clearly. When the eyes are adjusted to, the other can be seen clearly at the same time.

According to the sixth aspect, the position of the photographing range in the viewfinder screen is displayed when the near photographing distance has a large deviation of the photographing range from the viewfinder screen, that is, when parallax correction is necessary. In that case, the user can surely recognize that parallax correction is necessary and the position of the shooting range on the viewfinder screen.

In addition, if the light source is controlled so as to be turned off in other cases, the light source image is not displayed when the parallax correction is not necessary, which is not an obstacle. Also,
When the light source image is displayed, the parallax can be corrected only by adjusting the position of the displayed shooting range to a predetermined position of the shooting range.

According to the seventh aspect, for example, when the macro shooting mode for performing close-up shooting is set, the shift of the shooting range in the viewfinder screen becomes large, and when parallax correction is required, the viewfinder screen is displayed. By displaying the position of the shooting range, the user can be sure that the macro shooting mode is set and parallax correction is necessary and that the position of the shooting range on the viewfinder screen is recognized. can do. Moreover, in that case, the parallax can be corrected by simply adjusting the position of the displayed shooting range to a predetermined position of the shooting range.

If the light source is controlled so as to be turned off when the macro photography mode is not set, the light source image is not displayed when the macro photography mode is not set, which is not annoying, and is the same as in the prior art. There is no sense of incongruity as when the parallax correction mark is always displayed near the center of the viewfinder screen.

According to the eighth aspect, when the shutter speed or the aperture is changed to the limit of the variable range and the proper exposure corresponding to the brightness of the subject cannot be obtained, the user is notified of that fact. , It is possible to avoid shooting with overexposure or underexposure without realizing it.

[Brief description of drawings]

FIG. 1 is an external view of a camera equipped with a viewfinder screen display device according to a first embodiment of the present invention.

FIG. 2 is a top view showing the finder optical system of the camera shown in FIG.

FIG. 3 is a conceptual diagram of an optical system from a mask to an eye point when a pentagonal prism is replaced with a straight model in the first embodiment of the present invention.

FIG. 4 is a conceptual diagram of an optical system from a mask to an eye point when a wedge prism is added to the pentaprism of FIG. 3 and the pentaprism is replaced with a straight model.

FIG. 5 is a top view showing an actual optical system corresponding to FIG.

FIG. 6 is a diagram showing a state in which a light source image is displayed in the finder screen in the first embodiment of the present invention.

FIG. 7 is an external view of a mask formed in a flat plate shape and having a circular opening.

FIG. 8 is a diagram showing an example of diopter at each part of the contour of the light source image when the mask of FIG. 7 is used in the first embodiment of the present invention.

FIG. 9 is a diagram showing how a light source image looks when the eyes are adjusted so that the left and right ends of the light source image can be clearly seen when the mask of FIG. 7 is used in the first embodiment of the present invention.

FIG. 10 is a diagram showing how a light source image looks when the eyes are adjusted so that the upper and lower ends of the light source image can be clearly seen when the mask of FIG. 7 is used in the first embodiment of the present invention.

FIG. 11: A light ray emitted from an eye point, passing through an eyepiece lens that is a convex lens, and incident on a pentaprism from a fourth surface perpendicular to the optical axis, converges in a direction perpendicular to the paper surface after exiting from the second surface. FIG.

FIG. 12: A ray emitted from an eye point, passing through an eyepiece lens that is a convex lens, and entering a pentaprism from a fourth surface perpendicular to the optical axis, converges in a horizontal direction on the paper surface after exiting from the second surface. FIG.

FIG. 13 is a perspective view of a mask having a semicylindrical side surface provided with circular holes as openings.

FIG. 14 is a diagram showing an example of the diopter at each part of the contour of the light source image when the mask of FIG. 13 is used in the first embodiment of the present invention.

FIG. 15 is a control block diagram showing the overall configuration of a camera equipped with the finder screen display device according to the first embodiment of the present invention.

FIG. 16 is a flowchart showing how the display light source is controlled to be turned on / off / blinking in the first embodiment of the present invention.

FIG. 17 is a flowchart showing how the display light source is controlled to be turned on / off / blinking in the second embodiment of the present invention.

FIG. 18 is a view showing a state in which first and second light source images are displayed in the finder screen in the third embodiment of the present invention.

FIG. 19 is a first and second embodiment of the third embodiment of the present invention.
Is a flowchart showing how the display light source is controlled to be turned on / off / blinking.

FIG. 20 is a diagram showing how parallax occurs in a camera provided with a photographing optical system and a viewfinder optical system independently.

FIG. 21 is a diagram showing parallax correction marks displayed in the finder screen of a camera that includes a conventional photographic optical system and a finder optical system independently.

[Explanation of symbols]

1 Photographing optical system 2 Viewfinder optical system 3 Distance measuring optical system 4 Flash 5 Objective optical system 6 Roof prism 7 Penta prism 7a, 7b, 7c, 7d (of penta prism) first,
Second, third and fourth surfaces 8 Inversion optical system 9 Eyepiece 10 Eyepoint 11 Photometric lens 12 Photometric element 13 Display light source 14 Mask 14a Aperture 15 Wedge prism 16 Finder screen 17 Light source image 17a, 17b 1st, 1st Light source image of 2 18 Shooting range 18a, 18b Shooting range for near shooting distance and closest shooting distance 19 Autofocus frame 21 Control means 22 Photometric means 23 Distance measuring means 24 Shooting optical system position detecting means 25 Shooting mode setting member 26 Release member 27 Photographing optical system driving means 28 Display light source driving means

Claims (8)

[Claims] 1. A viewfinder screen for displaying information on a viewfinder screen obtained by a viewfinder optical system having an objective optical system, a reversing optical system including a prism, and a reversing optical system including a prism, and an eyepiece optical system mounted on a camera body independently In the internal display device, the information is information indicating a shooting situation, and in order to display the information, a light source light is emitted, and the light source light is obliquely incident on one surface of the prism, and then is displayed in the viewfinder screen. A viewfinder in-screen display device, comprising: a light source that is displayed as a light source image so as to be superimposed on a subject image; and a control unit that controls lighting / non-lighting of the light source according to the shooting situation. 2. The in-viewfinder screen display device according to claim 1, further comprising a light flux regulating mask which is arranged on an optical path of the light source light from the light source to one surface of the prism and has an opening of a predetermined shape. 3. The mask has a uniform visual distance from each point on the periphery of the opening to one surface of the prism, and when reaching the eye point through the prism and the eyepiece optical system. The finder in-screen display device according to claim 2, which is formed and set. 4. The mask has a semi-cylindrical outer shape, a circular hole is provided as an opening in a side surface of the semi-cylindrical shape, and the axis of the semi-cylindrical shape extends from the light source to the prism. The finder in-screen display device according to claim 3, wherein the finder in-screen display device is arranged at a predetermined angle with respect to a surface perpendicular to the optical axis of the light source light reaching one surface. 5. The mask is optically equivalent to an image plane formed by an objective optical system of the finder optical system, which moves according to a photographing distance on an optical path of a light source light from the light source to one surface of the prism. The finder in-screen display device according to any one of claims 2 to 4, wherein the display device is arranged within a moving range of the surface. 6. The photographing condition is such that the photographing range shifts from the viewfinder screen according to the photographing distance, and the light source indicates the position of the photographing range when the near photographing distance is large. The finder in-screen display device according to any one of claims 1 to 5, wherein the display device is turned on as follows. 7. The photographing condition is a photographing mode set by a user using a photographing mode setting member provided in the camera body, according to any one of claims 1 to 5. Display device in the viewfinder described. 8. The photographing condition is the brightness of a subject, and the control device lights or blinks the light source when the exposure to be changed corresponding to the brightness is out of a preset interlocking range. The finder in-screen display device according to any one of claims 1 to 5, which is controlled.