JPH07230117A - Finder device for single lens reflex camera - Google Patents

Abstract

PURPOSE:To provide a finder device for a single lens reflex camera whose constitution is simple and whose production cost is not increased as the finder device for a single lens reflex camera in which photographing information displayed by a transmission type LCD juxtaposed with a focusing screen is displayed in a state where it is superimposed on a subject image formed on the focusing screen and other photographing information is displayed within a finder visual field by using a light projecting unit. CONSTITUTION:This finder device for a single lens reflex camera is provided with the transmission type LCD 10 displaying the 1st photographing information and superimposing it on the subject image within the finder visual field, and juxtaposed with the focusing screen 53; the light projecting unit 18 constituted as a different body from the LCD 10, and projecting the 2nd photographing information; and a prism 19 reflecting the 2nd photographing information from the unit 18 toward the finder visual field; and in the finder device, the prism 19 is arranged so that its exiting surface may be adjacent to the opposed surface of the LCD 10 to the focusing screen 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viewfinder device for a single lens reflex camera.

[0002]

2. Description of the Related Art Conventionally, photographing information displayed by a transmissive LCD arranged side by side on a focusing plate is displayed by being superimposed on a subject image formed on the focusing plate, and further, L
There is known a single-lens reflex camera that uses a light projecting unit including a CD and an LED to display other shooting information in a viewfinder field. In this conventional single-lens reflex camera, the ridge at the lower end of the pentaprism is chamfered, and a prism configured as a member different from the pentaprism is provided close to the chamfered surface, and the prism is projected through this prism. The photographing information emitted by the optical unit is reflected toward the finder optical path.

However, this conventional structure requires a step of chamfering the pentaprism and a step of depositing a reflecting material on one surface of the prism, which increases the manufacturing cost of the finder.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, in which photographing information displayed by a transmissive LCD arranged in parallel with a focus plate is converted into a subject image formed on the focus plate. Provided is a viewfinder device of a single lens reflex camera which has a simple structure and does not increase the manufacturing cost, in the viewfinder device of the single lens reflex camera which displays the other image pickup information in the viewfinder field by superimposing and displaying. The purpose is to

[0005]

SUMMARY OF THE INVENTION According to the present invention, a transmissive LCD arranged in parallel with a focus plate for displaying first photographing information and superimposing the first photographing information on a subject image in a viewfinder field; A single-lens reflex camera that is configured as a separate unit from the above, and that has a light projecting unit that projects second shooting information; and a prism that reflects the second shooting information from this projection unit toward the viewfinder field. In this finder device, the prism is arranged such that the exit surface of the prism is adjacent to the surface facing the focusing plate of the transmissive LCD.

Furthermore, the present invention is fixed to the camera body,
A mirror box having a quick return mirror inside; a transmissive LCD arranged in parallel with a focus plate for displaying the first photographing information and superimposing the first photographing information on a subject image in the viewfinder field; A single-lens reflex camera that is configured as a separate body from the LCD and that has a light projecting unit that projects second shooting information; and a prism that reflects the second shooting information from this projection unit toward the viewfinder field. In the finder device of the camera, the mirror box has a prism housing recess facing the periphery of the transmissive LCD, and the prism has an exit surface of the prism adjacent to a surface facing the focus plate of the transmissive LCD. It is characterized in that it is arranged in the prism accommodating recess.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments. FIG. 3 is an exploded perspective view of essential parts showing a mode in which the finder apparatus to which the present invention is applied is mounted on a camera. Mirror box 51 fixed to a camera body (not shown)
Are openings 51a, 5a for allowing the light flux of the subject passing through the taking lens (not shown) to pass in the direction of the film and the viewfinder.
1b and 51c, and inside is provided with a quick return mirror 52 that moves to an observation position where the subject light flux is reflected in the pentaprism 70 direction and an exposure position where the subject light flux passes in the film direction.

A peripheral portion of the opening 51c is formed as a flange 52. A focus plate 53 is fixed to the lower surface 52b of the flange 52. Also, the flange 52
The AF distance measurement mark 11, the exposure correction mark 12 displayed as a bar graph, and the panorama display frame 13 are provided on the upper surface 52a of the.
The transmissive LCD 10 for superimposing the photographing information (first photographing information) such as the above with the subject image formed on the focusing plate 53 is fixed.

A prism mounting frame 60 is screwed to the upper edge portion 54 of the mirror box 51 located above the opening 51c by a plurality of screws 61. An inner peripheral flange 62 is formed at the lower end of the prism mounting frame 60, and the peripheral edge of the transmissive LCD 10 is sandwiched between the inner peripheral flange 62 and the flange 52.

A conductive rubber 16 and a flexible printed board 17 are sandwiched between the transmissive LCD 10 and the prism mounting frame 60. The conductive rubber 16 has a contact portion 16 b at one end thereof which is the contact portion 14 of the transmissive LCD 10.
The contact portion 16a at the other end is in pressure contact with the contact portion 17a of the flexible printed board 17.

A penta prism 70 is mounted on the prism mounting frame 60 with its lower portion positioned on the inner peripheral flange 62. The field frame 30 is provided between the penta prism 70 and the inner peripheral flange 62.

A unit fixing portion 55 and a prism fixing portion (prism housing recess) 56 adjacent to the unit fixing portion 55 are formed on one side of the upper portion of the mirror box 51. The unit fixing portion 55 emits shooting information (second shooting information) such as flash information, shutter speed, aperture value, focus information, and exposure correction information as shooting information light L.
The CD / LED unit (light projecting unit) 18 is fixed. The LCD / LED is attached to the prism fixing portion 56 via the incident surface 19a, the total reflection surface 19b and the exit surface 19c.
The pentaprism 7 receives the photographing information light emitted by the unit 18.
The prism 19 that reflects toward 0 is fixed. In the prism 19, the incident surface 19a is brought into contact with the light projecting portion 18a of the LCD / LED unit 18, and the exit surface 19c toward the penta prism 70 is focused on the focusing plate 53 of the transmissive LCD 10.
It is provided adjacent to the facing surface 10a. The photographing information light reflected by the prism 19 is reflected by the light-shielding portion 3 of the field frame 30.
The image is transmitted through a window 31 formed in the image 3 and viewed by the photographer.
FIG. 2 shows a field frame 30, a transmissive LCD 10, an LCD / LE.
The D unit 18 and the prism 19 are replaced by the pentaprism 7
It is the figure seen from the 0 side. In the figure, the transmissive LCD 10 and the LCD / LED unit 18 show a state in which all of the respective photographing information is displayed.

As shown in FIG. 1, in the finder device of this embodiment, the prism 19 has the exit surface 1 of the prism 19.
9c is arranged adjacent to the surface of the transmissive LCD 10 facing the focusing plate 53. The finder device of the present invention is characterized by this arrangement structure. 7 and 8
The configuration of the conventional example shown in FIG.
A surface 101 facing the exit surface 105a of the prism 105 is formed at the rear end of the lower part, and a prism 105 having the exit surface 105a arranged in parallel is provided on the surface 101.
According to the configuration in which the LCD / LED unit 110 is provided in close proximity, the step of forming the surface 101 on the pentaprism 100 and the surface 105b of the prism 105 are the same.
A step of depositing a reflective material on the surface 105b is necessary so as to reflect the photographing information light L projected by the LED unit 110. In the figure, 111 is a transmissive LCD, and 112 is a focusing plate. However, according to the prism device of the present invention, it is not necessary to form the surface 101 or the like on the pentaprism, and it is not necessary to form the surface 105b or the like on which the vapor deposition of the reflective material is necessary.

4 and 5 show the case where the prism 19 is arranged at a position other than the position shown in FIG. Figure 6
FIG. 6 is a view of the field frame 30, the transmissive LCD 10, the LCD / LED unit 18, and the prism 19 viewed from the pentaprism 70 side in the case of the arrangement shown in FIG. 5. As shown in FIG. 4, when the prism 19 is arranged above the transmissive LCD 10, the pentaprism 70 and the transmissive LCD 10 are separated from each other by the thickness of the prism 19 and the size of the device is increased. Further, since the visual field frame 30 and the focusing plate 53 are separated from each other, the difference in diopter between the subject image formed on the focusing plate 53 and the focusing plate 30 becomes large. On the other hand, as shown in FIG. 5, when the prism 19 is arranged so that the upper surface of the transmissive LCD 10 and the exit surface 19c of the prism 19 are located on the same surface, the arrangement shown in FIGS.
The field of view is lower than that in the case of, and as shown in FIG. 6, the part of the exit surface 19c that emits the imaging information light is outside the sealing portion 15 located at the peripheral edge of the transmissive LCD 10. Since the image pickup information observed in the window 31 moves away from the inner peripheral edge portion 32 of the light shielding portion 33,
It becomes difficult to visually recognize the photographing information observed in the area 1.

However, in this embodiment to which the present invention is applied, the exit surface 19c of the prism 19 is set to the transmissive LCD 1
Since it is arranged adjacent to the surface 10a facing the focusing plate 53 of 0, the photographing information displayed by the transmissive LCD 10 is compared with the subject image formed on the focusing plate 10 in spite of the simple structure. Display on top of each other, and
Other photographing information can be displayed at a position in the finder field of view that is easily visible by using the LED unit 18, and the finder device is not increased in size.

The transmissive LCD 10 and LCD.L
The various shooting information of the ED unit 18 is not limited to this embodiment, and other shooting information may be projected or displayed.

Further, in this embodiment, the penta prism 70 is used.
Although the visual field frame 30 is provided between the prism mounting frame 60 and the prism mounting frame 60, a similar visual field frame may be printed and provided on the transmissive LCD 10 instead of providing the visual field frame 30. With this configuration, the structure of the device can be simplified and the number of parts can be reduced.

Further, the pentaprism 70 of the above embodiment may be replaced with a cavity pentamirror.

[0019]

As described above, according to the viewfinder device of the single-lens reflex camera of the present invention, the exit surface of the prism is arranged adjacent to the surface facing the focusing plate of the transmissive LCD. With a simple structure, without increasing the manufacturing cost, the shooting information displayed by the transmissive LCD arranged in parallel with the focusing plate can be displayed by being superimposed on the subject image formed on the focusing plate, and the light projection can be performed. The unit can be used to display other shooting information at a position easily visible in the viewfinder field.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of a finder device to which the present invention is applied.

FIG. 2 is a diagram of a field frame, a transmissive LCD, a light projecting unit, and a prism viewed from a pentaprism side in the example.

FIG. 3 is an exploded perspective view of an essential part showing a mode in which the finder apparatus of the embodiment is mounted on a camera.

FIG. 4 is a diagram showing a case where the prism of the embodiment is arranged on an upper portion of a transmissive LCD.

FIG. 5 is a diagram showing a case where the prism of the embodiment is arranged such that an exit surface of the prism and an upper surface of a transmissive LCD are located on the same surface.

6 is a view of a field frame, a transmissive LCD, a light projecting unit, and a prism when viewed from the pentaprism side in the case of the arrangement shown in FIG.

FIG. 7 is a diagram showing a conventional example of a finder device.

FIG. 8 is an enlarged view showing a main part of the conventional example.

[Explanation of symbols]

 10 Transmissive LCD 10a Facing Surface 11 AF Distance Measurement Mark 12 Exposure Compensation Mark 13 Panorama Display Frame 14 Contact Point 15 Sealing Section 16 Conductive Rubber 17 Flexible Printed Circuit Board 18 LCD / LED Unit (Light Emitting Unit) 19 Prism 19c Ejection Surface 30 Field-of-view frame 31 Window 33 Light-shielding part 51 Mirror box 52 Quick return mirror 53 Focus plate 56 Prism fixing part (prism storage recess) 60 Prism mounting frame 70 Penta prism

Claims (4)

[Claims] 1. Displaying first photographing information, and superimposing this first photographing information on a subject image in a viewfinder field,
A transmissive LCD arranged in parallel with the focus plate; this transmissive LCD
And a prism for reflecting the second photographing information from the light-projecting unit into the viewfinder field.
In a viewfinder device of a single-lens reflex camera having a prism, the exit surface of the prism is a transmissive LCD.
A viewfinder device for a single-lens reflex camera, wherein the viewfinder device is disposed adjacent to a surface facing the focusing plate. 2. A mirror box fixed to a camera body and having a quick return mirror inside; a focus plate for displaying first photographing information and superimposing the first photographing information on a subject image in a viewfinder field. A transmissive LCD arranged in parallel; a light projecting unit configured separately from the transmissive LCD for projecting second shooting information; and second shooting information from the light projecting unit within the viewfinder field. In a viewfinder device of a single-lens reflex camera having a prism that reflects toward a mirror, the mirror box has a prism accommodating recess facing the periphery of the transmissive LCD, and the prism has an exit surface of the prism, the transmissive LCD. The finder device for a single-lens reflex camera, which is disposed in the prism housing recess adjacent to a surface facing the focusing plate. 3. The transmission type LC according to claim 1 or 2.
D is a viewfinder device for a single-lens reflex camera that has an integrated field frame. 4. The viewfinder device of a single-lens reflex camera according to claim 1, wherein the second photographing information is observed through a window formed in a light shielding portion of the field frame.