JP2001197336A - Electronic finder system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic finder system with which an actual subject image at a set value can be confirmed on the display part of a camera by picking up the image of the subject image of the focusing surface of a camera and photographic information displayed within a finder to project them on a display panel, performing data communication with the camera so as to receive exposure correcting quantity, AE lock information and subject luminance data from the camera to display them as an image on an LCD panel in accordance with the data. SOLUTION: The image pickup camera of an electronic finder is mounted to the finder eye port 40 of the camera and the electric contact 32 of the electronic finder is contact-connected to the contact 17 of the camera. The subject image of a focus plate 25 can be displayed on the display panel. Subject luminance information, exposure correcting information and lock information are transmitted from the camera to the electronic finder to control the brightness of the display panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic finder system in which an image of a subject is formed on a focus plate, such as a single-lens reflex camera, and an electronic finder is attached to a camera of a type for visually observing the image.

[0002]

2. Description of the Related Art In a single-lens reflex camera, a subject image formed on a focus plate provided on an equivalent surface of a film is viewed through a finder, so that the composition of the subject image, the focus state, and the like.
You can check the brightness. At the same time, photographing information such as shutter speed can be confirmed in the viewfinder. In some cases, it is necessary to be able to confirm these subject images and photographing information without looking through the eyepiece, depending on the photographing situation. In addition, if the user corrects the exposure value as needed in the viewfinder of the camera, the subject image after the exposure correction cannot be directly viewed. Therefore, it is desired to be able to confirm a subject image that changes according to the exposure correction amount.

[0003]

SUMMARY OF THE INVENTION The present invention meets the above-mentioned demands, and an object of the present invention is to capture an image of a subject on a focus surface of a camera and photographing information displayed in a viewfinder and display the image on a display panel. In addition, it performs data communication with the camera, receives the exposure correction amount, the AE lock information and the subject brightness data from the camera, and displays the LCD according to the data.
An object of the present invention is to provide an electronic finder system in which an image is displayed on a panel or the like so that an actual subject image at a set value of a camera can be confirmed on a display unit.

[0004]

In order to achieve the above object, an electronic finder system according to the present invention comprises means for forming a subject image by a photographing lens on a focusing plate disposed at a position equivalent to a film surface; A camera having a viewfinder display means for displaying the imaged subject image and a viewfinder viewing port for visually confirming the subject image on the focus plate and the information in the viewfinder by an eyepiece;
An imaging camera attached to the finder viewing port and imaging the subject image formed on the focus plate of the camera and the display in the finder through the eyepiece, and a display means for displaying an image signal of the imaging camera And an electronic finder having the following. The present invention also provides means for forming a subject image on a focusing plate disposed at a position equivalent to the film surface by a photographing lens, a viewfinder viewing port for visually confirming the formed subject image with an eyepiece, A camera control circuit unit for controlling the camera, a first data communication unit controlled by the camera control circuit unit for transmitting data of the camera, and electrically connected to an output of the first data communication unit; And a camera mounted on the finder viewing port and imaging the subject image formed on the focus plate of the camera and the display in the finder through the eyepiece lens. Display means for displaying an image signal of the imaging camera; second electric connection means connected to the first electric connection means; Second communication means for La and data communication, and an electronic viewfinder having exposure control means for controlling the exposure of the image pickup camera based on the data received from the camera. The first electric connection means in the present invention includes:
It is arranged near the eyepiece. The camera according to the present invention has subject brightness detecting means for detecting the brightness of the subject, and the data communicated between the camera and the electronic finder is composed of subject brightness data detected by the subject brightness detecting means. I have. The camera according to the present invention, an exposure correction amount setting means operable by a photographer,
Subject brightness detection means for detecting the brightness of the subject, and exposure control means for controlling the exposure of the camera based on the brightness data detected by the subject brightness detection means and the exposure correction amount, the camera and the electronic finder Is composed of exposure correction amount data and subject brightness data detected by the subject brightness detection means. The camera according to the present invention includes an exposure amount fixing instructing unit operable by a photographer, a subject luminance detecting unit detecting the luminance of the subject, and a camera based on the luminance data detected by the subject luminance detecting unit and the exposure amount. An exposure control unit for controlling exposure is provided, and data communicated between the camera and the electronic finder includes exposure amount fixing instruction information and subject brightness data detected by the subject brightness detection unit.

According to the above arrangement, the image on the focus plane of the camera can be confirmed on a liquid crystal screen or the like, and cannot be confirmed on the camera side even if the exposure compensation is set. The image of brightness can be confirmed.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram showing a first embodiment of an electronic finder system according to the present invention. The reflected light from the subject 3 passes through the photographing lens 4 and the main mirror 5 to form an image on the focus plate 2 disposed on the equivalent surface of the film 6. Photographing information such as a shutter speed is displayed on a display unit 13 in the finder provided at the same position as the focus plate 2. The subject image on the focus plate 2 and the photographing information on the display unit 13 in the viewfinder are stored in the
Through the viewfinder.

[0007] An electronic finder 9 is provided in the finder viewing port.
A screw for mounting the imaging camera tip is provided. The electronic finder 9 includes an imaging lens 11 and a CCD.
And an electronic finder body 9b including a display panel 10 and a display panel drive circuit (not shown). At the tip of the imaging camera 9a, a ring 15 for coupling to a screw in a camera finder viewing port is rotatably attached. A screw is formed on the inner wall of the ring 15, and the front end of the imaging camera 9 a is coupled to the finder viewing port by screwing with the screw in the finder viewing port, so that the electronic finder 9 can be mounted. The electronic finder 9 has an L-shaped cross section, and the display panel 10 comes into close contact with the rear surface of the camera 1 when the tip of the imaging camera is mounted.

FIG. 2 is a diagram showing details of the electronic finder and the display panel of FIG. A subject image 10a formed on the focus plate 2 is displayed on the display panel 10, and a finder display 10b of photographing information such as a shutter speed and an aperture value is provided below.
Is projected. It is possible to directly check the condition (brightness, focus state, composition, etc.) of the subject image on the focus plate of the camera.

FIG. 3 is a schematic diagram showing a second embodiment of the electronic finder system according to the present invention. Subject 3
The reflected light from the camera 8 and the main mirror 26
, The focus plate 2 provided on the equivalent surface with the film 28
5 is formed. The subject image on the focus plate 25 becomes an erect image by the pentaprism 45, and can be observed from the finder viewing port 40 through the eyepiece 48. A screw 40 for coupling to the electronic finder 39 is provided around the finder viewing port 40.
a is formed. Part of the light emitted from the pentaprism 45 enters the photometric sensor 29, and the photometric data is sent to the camera control circuit unit 30. Camera control circuit 3
The data information output of 0 is connected to the electrical contact 17 provided above the viewfinder viewing port 40.

On the other hand, the electronic finder 39 comprises an electronic finder main body 39a and an electronic finder display side 39b. A ring 43 having a screw 43a formed on the inner wall is rotatably attached to the lens frame distal end 42 of the electronic finder body 39a. The signal of the subject image formed on the CCD 36 by the imaging lens 35 is sent to the imaging camera control circuit unit 34. The electrical contact 32 is provided above the lens frame tip 42 and is connected to the communication circuit 33. The output of the communication circuit 33 is based on the imaging camera control circuit 3
4 A display panel (LCD) 37 and a drive circuit (not shown) for driving the display panel 37 are provided on the electronic finder display side 39b.

The electronic finder display side 39b is rotatably attached to the electronic finder body 39a by the shaft 22. By screwing the screw 43a of the ring 43 into the screw 40a of the finder viewing port 40 of the camera, the finder viewing port 40 and the lens frame tip 42 of the electronic finder 39 can be connected. The electric contact 32 of the electronic finder 39 can be held in contact. The electronic finder 39 is mounted on the camera, and the camera's exposure control signal and the like can be sent to the electronic finder side. FIG. 3B shows a state in which the electronic viewfinder display side 39b is rotated to a position perpendicular to the electronic viewfinder main body 39a, and the display panel 37 is in a state where the electronic viewfinder display side 39b is in close contact with the back of the camera. Images can be observed. FIG. 3C shows a state in which the electronic viewfinder display side 39b is rotated to be parallel to the electronic viewfinder main body 39a, which is convenient for observing an image on the display panel 37 from the upper surface of the camera. good.

FIG. 4 is a perspective view showing an embodiment of the appearance of a camera used in the electronic finder system according to the present invention. A screw 18 a for coupling to the electronic finder is provided on the outer periphery of the finder viewing port 18. An electrical contact 17 comprising a plurality of contacts above the finder viewing port 18
Is arranged. A shutter button 20, an exposure compensation setting dial 21, and a metering mode switching dial 19 are provided above the upper cover of the camera 16.

FIG. 5 is a block diagram showing an embodiment of a circuit of the electronic finder system according to the present invention. Camera control circuit unit 30 shown in FIG. 3 as a camera side circuit
Includes a camera control circuit 49, an exposure calculation circuit 47, an exposure correction setting circuit 50, and a communication circuit 51. A photometry circuit 46 is connected to the exposure calculation circuit 47. The camera control circuit 49 includes a shutter control unit and an aperture control unit 2.
7 is connected. The electronic finder circuit includes a communication circuit 33, an imaging camera control circuit 55, an electronic finder photometry circuit 52, an imaging camera 53, a display control circuit 54, and a display panel 37. Communication circuits 33 and 5
1 performs data communication. The photometric circuit 46 detects the brightness of the subject with the photometric sensor 29 and outputs a photometric value. The exposure calculation circuit 47 obtains photometric data (subject luminance information) and calculates an exposure value. For example, when the exposure value is set in the program AE, the exposure value is determined based on the program value.

The camera control circuit 49 obtains each data from the exposure calculation circuit 47 and obtains the shutter control section and the aperture control section 27.
Control. In addition, subject luminance information is also transmitted to the imaging camera control circuit 55 via the communication circuits 51 and 33. The imaging camera control circuit 55 controls the display control circuit 54 based on the sent subject luminance information, and controls the brightness of the display panel of the subject image input from the imaging camera 53.

When the exposure value is corrected by operating the correction setting dial 21 (FIG. 4), the exposure correction data is sent from the exposure correction setting circuit 50 to the exposure calculation circuit 47. The exposure calculation circuit 47 performs a calculation according to the exposure correction amount, and transmits the exposure data to the camera control circuit 49. Camera control circuit 4
Reference numeral 9 transmits the corrected exposure data to the imaging camera control circuit 55 via the communication circuits 51 and 33. The imaging camera control circuit 55 corrects the exposure of the imaging camera according to the exposure correction set on the camera side. Thereby, the brightness of the image on the display panel 37 changes according to the correction amount.

Next, when the AE lock SW 56 of the camera is operated, the camera control circuit 49 sends the lock information to the imaging camera control circuit 55 of the electronic finder via the communication circuits 51 and 33. The imaging camera control circuit 55 controls the display control circuit 54 to lock the brightness. In the above embodiment, the subject brightness information, exposure correction information, and exposure lock information are obtained from the camera side to control the display panel on the finder side. In addition to this configuration, the subject brightness information is received from the camera side. Alternatively, as shown in FIG. 5, it is also possible to independently provide the photometric circuit 52 on the electronic finder side and control the display panel based on the photometric value.

[0017]

As described above, according to the present invention,
You can observe the subject image and shooting information on the camera's focus plane on the display panel of the electronic viewfinder, and send the camera's subject brightness information and exposure correction information to the electronic viewfinder. Even if the result could not be confirmed even though the result was not confirmed, there is an advantage that an image having a brightness changed according to the correction amount can be confirmed on the electronic finder.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a first embodiment of an electronic finder system according to the present invention.

FIG. 2 is a diagram showing details of an electronic finder and a display panel of FIG. 1;

FIG. 3 is a schematic diagram showing a second embodiment of the electronic finder system according to the present invention.

FIG. 4 is a perspective view showing an embodiment of the appearance of a camera used in the electronic finder system according to the present invention.

FIG. 5 is a block diagram showing an embodiment of a circuit of the electronic finder system according to the present invention.

[Explanation of symbols]

 1, 16 camera 2, 25 focus plate 3, 38 subject 4, 41 photographing lens 5, 26 main mirror 6, 28 film 8, eyepiece 9, 39 electronic finder 10, 37 display panel ( LCD) 11, 35: Imaging lens 12, 36: Image sensor (CCD) 13: Display unit in finder 17, 32: Electrical contact 18: Viewfinder opening 19: Metering mode switching dial 20: Shutter button 27: Shutter control unit Aperture control unit 29 photometric sensor 30 camera control circuit unit 33, 51 communication circuit 34 imaging camera control circuit unit 46 photometric circuit 47 exposure calculation circuit 49 camera control circuit 50 exposure compensation setting circuit 53 imaging Camera 54: Display control circuit 55: Imaging camera control circuit

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Mari Takahashi 2-14-9 Tamagawadai, Setagaya-ku, Tokyo Kyocera Corporation Tokyo Yoga Office F-term (reference) 2H018 AA32 2H102 AA01 AA16 BB08 CA03 2H105 CC21 5C022 AA13 AC03 AC04 AC14 AC54 AC69

Claims (6)

[Claims] 1. A means for forming a subject image by a photographing lens on a focus plate arranged at a position equivalent to a film surface, a display unit in a finder for displaying the formed subject image, and a display on the focus plate A camera having a finder viewing port through which an image of the subject and the information in the finder can be visually confirmed by an eyepiece; a subject image mounted on the finder viewing port and formed on a focus plate of the camera; and a display in the finder. An electronic finder system comprising: an imaging camera that captures an image through the eyepiece; and an electronic finder having a display unit that displays an image signal of the imaging camera. 2. A means for forming a subject image on a focusing plate disposed at a position equivalent to a film surface by a photographing lens, a viewfinder viewing camera for visually confirming the formed subject image by an eyepiece, and a camera. Camera control circuit for controlling the camera, first data communication means controlled by the camera control circuit, and transmitting camera data;
A camera electrically connected to the output of the data communication means and having first electrical connection means for making an electrical connection with the outside; and a subject mounted on the viewfinder viewing port and forming an image on a focus plate of the camera. An imaging camera for capturing an image and the display in the viewfinder through the eyepiece; a display unit for displaying an image signal of the imaging camera; a second electrical connection unit connected to the first electrical connection unit; Second communication means for performing data communication with the camera via the connection means,
An electronic finder system comprising: an electronic finder having exposure control means for controlling exposure of the imaging camera based on data received from the camera. 3. The electronic finder system according to claim 2, wherein said first electric connection means is arranged near an eyepiece. 4. The camera has subject brightness detecting means for detecting the brightness of a subject, and the data communicated between the camera and the electronic finder is subject brightness data detected by the subject brightness detecting means. 3. The electronic finder system according to claim 2, wherein: 5. The camera according to claim 1, further comprising: an exposure correction amount setting unit operable by a photographer; a subject brightness detection unit detecting a brightness of the subject; and a brightness data detected by the subject brightness detection unit and the exposure correction amount. Exposure control means for controlling the exposure of the camera based on the data, wherein the data communicated between the camera and the electronic finder are exposure correction amount data and subject brightness data detected by the subject brightness detection means. The electronic finder system according to claim 2, wherein 6. The camera according to claim 1, wherein the camera is configured to perform an exposure amount fixing instruction unit operable by a photographer, a subject brightness detection unit detecting the brightness of the subject, and a camera based on the brightness data detected by the subject brightness detection unit and the exposure amount. Exposure control means for controlling the exposure of the camera, the data communicated between the camera and the electronic viewfinder, exposure amount fixed instruction information and subject brightness data detected by the subject brightness detection means, characterized in that, 3. The electronic finder system according to claim 2, wherein: