JP2015219460A - Photographing device, method for controlling photographing device, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photographing device to which a compact lens can be applied.SOLUTION: The photographing device includes a control part which performs control so as to exchange the position of a focusing screen and the position of an imaging element with respect to an image formation position and an optical part which optically converts an inverted image which is a subject image, formed on the focusing screen located in the image formation position into an erected image and guides it to a finder. The control part exchanges the position of the focusing screen and the position of the imaging element, so as to form the subject image on the focusing screen in a photographing preparatory state and form the subject image on the imaging element in a photographing state.

Description

  The present invention relates to a photographing apparatus, a photographing apparatus control method, and a program.

  Conventionally, various configurations for switching between an optical path of an optical viewfinder (optical viewfinder: OVF) and an optical path of an image sensor are known. The most common is to place a mirror in the optical path between the lens and the image sensor, guide the image to the focusing screen on the front of the optical viewfinder with the mirror when preparing for shooting, and rotate the mirror only during shooting to rotate the mirror. This is a mirror system in the optical path that deflects from the optical path. In the optical path mirror method, the direction of the optical path is changed by using a translucent mirror called a pellicle mirror, or by using a micromirror as disclosed in Patent Document 1.

JP 2012-118477 A

  However, in the method having a mirror in the optical path behind the lens as in Patent Document 1, the optical path to the image sensor extends by the distance of the portion where the mirror is arranged, so that the back focus of the lens (flange back of the body) is lengthened. Therefore, there is a problem that the lens becomes large.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a photographing apparatus to which a small lens can be applied.

The photographing apparatus according to the present invention that achieves the above object is as follows.
Control means for controlling the position of the focusing screen and the position of the imaging device to be switched with respect to the imaging position;
Optical means that optically converts an inverted image that is a subject image formed on the focusing screen located at the imaging position into an erect image and guides it to a viewfinder,
The control means includes: a position of the focusing screen and a position of the imaging element so that the subject image is formed on the focusing screen in a shooting preparation state and the subject image is formed on the imaging element in a shooting state. It is characterized by replacing.

  ADVANTAGE OF THE INVENTION According to this invention, the imaging device which can apply a small lens can be provided.

1 is a diagram illustrating a configuration example of a photographing apparatus according to a first embodiment. The figure which shows the structural example of the image pick-up element mounting board which concerns on 1st Embodiment. Explanatory drawing of the mechanism which coaxially rotates the focusing screen, mirror, and image pick-up element mounting plate based on 2nd Embodiment Explanatory drawing of the mechanism using the erecting optical system which replaces a focusing screen and an image pick-up element mounting board based on 3rd Embodiment, and the directions of incident light and an emitted light are the same.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
<1. Configuration of photographing apparatus>
First, with reference to FIG. 1, the structure of the imaging device (for example, single-lens reflex camera) concerning a 1st embodiment is explained. FIG. 1 (a) shows a state at the time of shooting preparation, and FIG. 1 (b) shows a state at the time of shooting.

  In FIG. 1A, 101 is a camera body, 102 is a lens case attached to the camera body 101, 103 is an optical lens in the lens case 102, 104 is a focusing screen that connects the images of the lens 103, and 105 is a focusing screen 104. A mirror for guiding the formed inverted image upward, 106 is a pentaprism for changing the inverted image to an erect image, and 107 is. The pentaprism 106 optically converts an inverted image, which is a subject image, formed on the focusing screen 104 positioned at the image formation position into an erect image and guides it to the eyepiece 107 (finder).

  In FIG. 1B, reference numeral 108 denotes an image pickup device for picking up an image of a subject image of the lens 103, 109 denotes an image pickup device mounting plate on which the image pickup device 108 is mounted, 110 denotes a signal from the image pickup device 108, An electronic circuit module 111 controls the operation of various mechanisms, and a liquid crystal panel 111 displays video output processed by the electronic circuit module.

  Here, each of the focusing screen 104, the mirror 105, and the image sensor mounting plate 109 is configured to be able to instantaneously rotate and move by an electromagnetic mechanism (not shown) with one side as a rotation axis.

  In the shooting preparation state, as shown in FIG. 1A, the subject image from the lens 103 is formed on the focusing screen 104, and the image is guided to the upper part via the mirror 105, and converted into an erect image by the pentaprism 106. As a result, the user can check the subject image through the eyepiece 107.

  When the user fully presses a shutter (not shown), the electronic circuit module 110 uses an electromagnetic mechanism (not shown) to focus the focusing screen 104, the mirror 105, and the image sensor mounting plate 109 around the respective rotation axes. Move to position 1 (b).

  When the movement is finished, photographing is performed at the position shown in FIG. The subject image from the lens 103 is formed on the image sensor 108, the signal from the image sensor 108 is input to the electronic circuit module 110 via a cable (not shown), and the image processed by the electronic circuit module 110 is stored in a memory (not shown). And displayed on the liquid crystal panel 111. Thereby, the user can confirm the image being photographed. When still images are being taken one by one, the focusing screen 104, the mirror 105, and the image sensor mounting plate 109 are shown in FIG. 1A in response to detecting that the user's finger has been removed from the shutter. Return to the position ready for shooting. As described above, the electronic circuit module 110 performs control so that the position of the focusing screen and the position of the image sensor are switched with respect to one image formation position.

  In moving image shooting and continuous shooting, the state of FIG. 1B is continued, and the focusing screen 104, the mirror 105, and the image sensor mounting plate 109 are moved as shown in FIG. 1A according to the end of moving image shooting and continuous shooting. Return to the position ready for shooting. This allows the user to continue shooting while confirming the image displayed on the liquid crystal panel 111. In addition, you may make it the structure which mounts both an optical finder and an electrical finder. When the focusing screen is at the imaging position, the image from the optical viewfinder is guided to the eyepiece lens, and when the imaging device is at the imaging position, the image from the electric viewfinder is guided to the eyepiece lens. With this configuration, the user can continue moving image shooting while looking at the eyepiece 107.

<2. Configuration of image sensor mounting plate>
Next, the configuration of the image sensor mounting plate according to the present embodiment will be described with reference to FIG. 2A is a front view of the image sensor mounting plate 109, and FIG. 2B is a side view. The solid line in the side view indicates the position in the shooting state, and the dotted line indicates the position in the shooting preparation state.

  The image pickup element 108 and the image pickup element mounting plate 109 are the same as those in FIG. 1, 201 is a rotation shaft that becomes a fulcrum of the image pickup element mounting plate 109, 202 is a rotation spring that applies tension to the rotation shaft 201, and 203 is electromagnetically moved. Permanent magnet 204, a contact plate for determining the stop position, 205 an electromagnet for electromagnetically moving, 206 a stop position plate for determining the position of the image sensor mounting plate 109 in the shooting state, and 207 an image sensor mounting Stop position plates 208 and 209 for determining the position of the plate 109 in the shooting preparation state are vibration preventions using silicon gel or the like for preventing vibration of the image sensor mounting plate 109 when positioning in the shooting state and the shooting preparation state. A member 210 is a flexible cable that connects the image sensor 108 and an electronic circuit module 110 (not shown).

  Since no current flows through the electromagnet 205 at the time of shooting preparation, the imaging element mounting plate 109 is positioned at the dotted line in FIG. At the time of shooting, when an electric current is applied to the electromagnet 205 to generate a magnetic flux in the same polarity direction as the permanent magnet 203, the image sensor mounting plate 109 rotates and moves around the rotating shaft 201 to the position of the solid line by the repulsive force. . The movement stops at the position where the abutment plate 204 abuts against the stop position plate 206.

  There is a vibration preventing member 208 made of a material such as silicon gel or cushion rubber in order to absorb vibration caused by rebounding in a short time after the butting plate 204 hits the stop position plate 206. , Can absorb shock and prevent vibration. By this shock absorbing mechanism, it is possible to prevent the image sensor 108 from being broken due to repeated shocks. Since the image sensor 108 needs to be accurately in focus, it is desirable that the positions of the rotary shaft 201 and the stop position plate 206 can be finely adjusted at the factory.

  When the imaging is finished, when an electric current is applied so that the electromagnet 205 has a reverse polarity and the permanent magnet 203 is attracted, the image sensor mounting plate 109 rotates around the rotation axis 201 to the position of the dotted line.

  Since the abutting mechanism for stopping at the position at the time of shooting preparation is the same as the abutting mechanism at the time of shooting, description thereof is omitted. Finally, when the current of the electromagnet 205 is turned off, the image sensor mounting plate 109 remains at the position for preparing for photographing due to the tension of the rotary spring 202. Note that if the tension of the rotary spring 202 is increased, the current returns to the position at the time of shooting preparation only by turning off the current of the electromagnet 205.

  Note that the focusing screen 104 and the mirror 105 in FIG. 1 can also be rotated and moved by the same mechanism as that of the image sensor mounting plate 109 in FIG. Here, returning to FIG. 1, the operation mechanism of the focusing screen 104, the mirror 105, and the image sensor mounting plate 109 will be described.

  In order to make a transition from the time of shooting preparation in FIG. 1A to the time of shooting (b) in FIG. 1B, first, the mirror 105 is moved backward, the focusing screen 104 is moved upward, and the image sensor mounting plate is moved. 109 is moved forward. In order to transition from the time of shooting in FIG. 1B to the time of shooting preparation in FIG. 1A, first, the image sensor mounting plate 109 is moved backward, the focusing screen 104 is moved forward, and the mirror 105 is moved forward. Moving.

  These controls are performed by a control method in which a microprocessor in the electronic circuit module 110 is programmed in advance, but may be performed by a sequencer formed by an electronic circuit in the electronic circuit module.

  In addition, in order to realize the gist of the present invention, various variations are possible in addition to the mechanism described in the first embodiment. The gist of the present invention is to move the focusing screen and the image sensor to the same position where the subject image is formed at the time of shooting preparation and shooting, respectively, and convert the focusing screen image to an erect image to convert the eyepiece to an eyepiece. There is a place to lead to. As a moving mechanism for that purpose, not only a mechanism for rotational movement but also a mechanism for sliding in the horizontal direction or the front-rear direction may be used.

  In order to operate the moving mechanism, not only an electromagnetic mechanism but also a capacitance may be used, or a small motor having a large torque such as an ultrasonic motor may be used. In addition, a mirror is not necessarily required between the focusing screen and the pentaprism, and in order to erect an image, not only the pentaprism but also an erecting optical system such as a Dach mirror, a Porro prism, or a Porro mirror can be used. . The liquid crystal panel can be similarly implemented as long as it is a small display device such as an organic EL display.

  As described above, according to the present embodiment, since the focusing screen and the image pickup device can be switched without placing a mirror between the lens and the image pickup device, a small-sized photographing device that can be easily manually focused is provided. can do.

  Furthermore, when the lens is replaced, the image pickup device can be disposed at a deep position, so that there is an effect that it is difficult for dust to adhere to the image pickup device. Even if dust adheres to the image sensor, there is an effect that the dust is detached when the image sensor moves at high speed.

(Second Embodiment)
Next, referring to FIG. 3, as a second embodiment, a mechanism example for coaxially rotating a focusing screen, a mirror, and an image sensor mounting plate will be described. The same components as those in the first embodiment are denoted by the same reference numerals.

  FIG. 3 is an explanatory diagram of a mechanism for coaxially rotating the focusing screen, the mirror, and the image sensor mounting plate. 3A is a side view at the time of shooting preparation, FIG. 3B is a side view at the time of shooting, FIG. 3C is a front view at the time of shooting preparation, and FIG. It is a front view at the time of imaging | photography.

  In FIGS. 3A to 3D, the optical lens 103, the pentaprism 106, and the eyepiece lens 107 have the same configurations as those described in FIG. Reference numeral 301 denotes a rotating plate constituting the rotating unit, 302 a rotation center axis of the rotating unit, 303 a focusing screen fixed to the rotating plate 301, 304 a mirror fixed to the rotating plate 301, and 305 fixed to the rotating plate 301. An image sensor mounting plate 306 is an image sensor mounted on the image sensor mount plate 305, and a phase difference detection element 307 is mounted on the focusing screen 303.

  The focusing screen 303 is on a (virtual) first surface, the image sensor 306 is on a (virtual) second surface different from the first surface, and the mirror 304 is on the first surface and the second surface. Are provided on different (virtual) third surfaces, respectively. In the example of FIG. 3, the first surface and the second surface are orthogonal to each other, and the angle formed between the first surface and the third surface and the angle formed between the second surface and the third surface are 45. Degree. However, the angle formed by these surfaces is not limited to the example shown in FIG. 3, and various modifications are possible.

  At the time of shooting preparation, as shown in FIGS. 3A and 3C, the subject image from the lens 103 is formed on the focusing screen 303, guided upward by the mirror 304, and upright by the pentaprism 106. The user visually recognizes through the eyepiece 107.

  In preparation for photographing, the phase difference indicating how much the focus of the image is shifted is detected by one or a plurality of phase difference detecting elements 307 arranged on the focusing screen 303. A signal from the phase difference detection element 307 is sent to the electronic circuit module 110 shown in FIG. 1 through a cable (not shown).

  When the user half-presses a shutter (not shown), the electronic circuit module 110 estimates and calculates the distance to move the focus of the lens 103 from the detected value of the phase difference by the phase difference detecting element 307, and the lens group in the lens 103 is moved. Move to focus.

  When the user fully presses a shutter (not shown), the rotating plate 301 rotates 90 degrees around the rotating shaft 302 and rotates to the position at the time of photographing. As a method of driving the rotating portion, an electromagnetic method as shown in FIG. 2 may be used, or a motor having a large driving force such as an ultrasonic motor may be used.

  At the time of shooting, as shown in FIGS. 3B and 3D, a subject image from the lens 103 is formed on the image sensor 306, and a signal from the image sensor is used using a cable (not shown). It is sent to an electronic circuit module (not shown). Note that the electrical configuration for sending the signal may be a cable, a connection by a terminal arranged on the rotating shaft, or a wireless communication unit. When the user releases the shutter and the photographing is completed, the rotating plate 301 rotates 90 degrees in the reverse direction around the rotation shaft 302 and rotates to the position at the time of photographing preparation.

  In this embodiment, the example which mounts the element which needs an electrical connection as a phase difference detection element on the focusing screen was shown. In addition, the phase difference may be detected by mounting only the optical element portion on the focusing screen and observing the optical element with a micro camera mounted on the fixed portion. According to this configuration, it is not necessary to provide wiring for transmitting a signal on the finder screen, so that the field of view becomes clear.

  According to the present embodiment, there is an effect that autofocusing is performed at high speed by the phase difference detecting element arranged on the focusing screen. In addition, since the photographing preparation state and the photographing state can be switched simply by rotating the integrated rotation mechanism by 90 degrees about the same axis, it is possible to reduce the shutter time lag.

(Third embodiment)
Next, referring to FIG. 4, as a third embodiment, an example of a mechanism using an erecting optical system in which the focusing screen and the imaging device mounting plate are replaced and the directions of incident light and outgoing light are the same will be described. The same components as those in the first embodiment are denoted by the same reference numerals.

  4A is a side view at the time of shooting preparation, and FIG. 4B is a side view at the time of shooting. 4A to 4B, the lens 103, the focusing screen 104, the eyepiece lens 107, the image sensor 108, and the image sensor mounting plate 109 are the same as those described in FIG. 401 is a Porro prism which is an erecting optical system in which the directions of incident light and outgoing light are the same.

  First, at the time of shooting preparation, the subject image from the lens 103 is formed on the focusing screen 104 as shown in FIG. Thereafter, in the first embodiment, the light is guided upward by the mirror, but in this embodiment, the mirror is not provided. Instead, it is converted into an erect image using a Porro prism 401 which is an example of an erecting optical system in which the directions of incident light and outgoing light are the same, and the user observes the imaging state through the eyepiece 107. Since the optical path axis is deviated from the optical axis of the lens by the Porro prism 401, it is suitable for the user to observe with the right eye that the camera is shifted to the upper left side of the camera.

  Also in this embodiment, when the user half-presses the shutter, the autofocus is performed using the phase difference detection element on the focusing screen 104 as in the case shown in FIG.

  Next, when the user fully presses the shutter, the focusing screen 104 is flipped up, and then the image sensor mounting plate 109 is rotated forward to the position shown in FIG. The imaging is converted into a signal by the image sensor 108, sent to the electronic circuit module 110 via a cable (not shown), stored after image processing, and displayed on a liquid crystal panel (not shown). When shooting a moving image, recording is performed while continuing auto-focusing with the contrast method or the image plane phase difference detection method using the image sensor 108 at this position.

  When the user releases the shutter, the image sensor mounting plate 109 is rotated downward, the focusing screen 104 is rotated forward, and the camera is returned to the position for preparation for shooting shown in FIG.

  In the present embodiment, since a moving mirror is not required, the size can be further reduced. Also in the present embodiment, the movement of the focusing screen and the imaging device mounting plate is not limited to the rotational movement, and may be moved vertically in the vertical direction and in the horizontal direction perpendicular to the optical axis. In that case, further miniaturization is possible.

  As mentioned above, although embodiment of this invention was explained in full detail, it can apply to apparatuses other than a single-lens reflex camera within the range of the summary of this invention. For example, a compact camera with a built-in lens can be implemented in the same manner, or it can be implemented as a binocular that can be photographed. Even in a video camera, it can be used to check the composition and focus before shooting. It can also be used to switch between observation and photographing in an endoscope or a microscope.

(Other embodiments)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

  DESCRIPTION OF SYMBOLS 101: Camera body, 102: Lens case, 103: Lens, 104: Focusing screen, 105: Mirror, 106: Pentaprism, 107: Eyepiece lens, 108: Image sensor, 109: Image sensor mounting board, 110: Electronic circuit module 111: Liquid crystal panel

Claims (12)

Control means for controlling the position of the focusing screen and the position of the imaging device to be switched with respect to the imaging position;
Optical means that optically converts an inverted image that is a subject image formed on the focusing screen located at the imaging position into an erect image and guides it to a viewfinder,
The control means includes: a position of the focusing screen and a position of the imaging element so that the subject image is formed on the focusing screen in a shooting preparation state and the subject image is formed on the imaging element in a shooting state. An imaging device characterized by replacing A first rotating mechanism for rotating the focusing screen;
A second rotation mechanism that rotates and moves the image sensor;
The said control means controls the operation | movement of a said 1st rotation mechanism and a said 2nd rotation mechanism, and replaces the position of the said focusing screen and the position of the said image pick-up element. Shooting device. A rotation mechanism for rotating the focusing screen, the imaging element, and a mirror that guides an inverted image formed on the focusing screen to the optical means as a unit around one rotation axis;
The imaging apparatus according to claim 1, wherein the control unit controls an operation of the rotation mechanism to switch a position of the focusing screen and a position of the imaging element.   The focusing screen is on a first surface, the imaging element is on a second surface different from the first surface, and the mirror is on a third surface different from the first surface and the second surface. The photographing apparatus according to claim 3, wherein each of the photographing apparatuses is provided. The first surface and the second surface are orthogonal to each other;
The imaging apparatus according to claim 4, wherein an angle formed between the first surface and the third surface and an angle formed between the second surface and the third surface are 45 degrees. An image sensor mounting plate for mounting the image sensor;
A first stop position plate for determining a position of the imaging element mounting plate in the shooting state;
The photographing apparatus according to claim 1, further comprising: a first vibration preventing member that prevents vibration of the imaging element mounting plate during positioning in the photographing state. A second stop position plate for determining the position of the imaging element mounting plate in the shooting preparation state;
The imaging apparatus according to claim 6, further comprising: a second vibration preventing member that prevents vibration of the imaging element mounting plate at the time of positioning in the preparation state.   The photographing apparatus according to claim 1, wherein a phase difference detection element is disposed on the focusing screen. Further equipped with a micro camera,
The photographing apparatus according to claim 1, wherein the micro camera detects a phase difference by observing an optical element arranged on the focusing screen.   When the focusing screen is at the imaging position, the image from the optical viewfinder is guided to the eyepiece, and when the imaging device is at the imaging position, the image from the electric viewfinder is guided to the eyepiece. The photographing apparatus according to claim 1, wherein the photographing apparatus emits light. Control means for controlling the position of the focusing screen and the position of the imaging device to be switched with respect to the imaging position;
A control method of an imaging apparatus comprising: an optical unit that optically converts an inverted image that is a subject image formed on the focusing screen located at the imaging position into an erect image and guides the image to a finder;
The position of the focusing screen and the position of the imaging element are such that the control means forms the subject image on the focusing screen in the shooting preparation state and forms the subject image on the imaging element in the shooting state. A method for controlling a photographing apparatus, comprising a step of replacing the two.   The program for making a computer perform the control method of the imaging device of Claim 11.

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