JP2016206568A - Camera system, interchangeable lens, and camera - Google Patents

Abstract

When an interchangeable lens is reversed and attached to a camera, the lens cannot be controlled correctly only by connecting a signal line through an adapter or the like. A lens having contact points with a camera at a plurality of locations has lens control information according to the location of the contact point attached to the camera, and switches the lens control information according to the location of the contact point attached to the camera. . [Selection] Figure 1

Description

  The present invention relates to a camera system capable of reversing a lens.

  2. Description of the Related Art Conventionally, a so-called reverse macro photography technique that enables close-up photography by inverting a lens to a camera is known. In this way, when the lens is attached to the camera in the reverse direction, a reverse attachment adapter is attached to the filter screw on the front surface of the lens so that it can be connected to the camera. In this case, the camera and the lens are not electrically connected, and it is impossible to control the diaphragm and exchange information from the camera.

  Therefore, as described in Patent Document 1, an adapter that extends the signal of the lens mount to the lens tip, or as described in Patent Document 2, an electronic contact with the camera is also provided at the lens tip. There is also a camera that allows information to be exchanged between the camera and the lens.

Japanese Patent Laid-Open No. 5-126636 JP 2004-361625 A

  Both of the inventions described in Patent Document 1 and Patent Document 2 are based on the optical performance when the lens is reversed, although the exchange of information with the camera and the operation of the automatic iris itself are possible even when the lens is reversed. If you try to drive photometric information or autofocus, it will not work properly. This is because, when the lens is reversed, the control information when the lens is reversed is not retained, for example, the direction in which the lens should be driven is reversed.

Therefore, in order to solve the above problem, the invention according to claim 1
A lens having a plurality of contact points with a camera has lens control information corresponding to the location of the contact point attached to the camera, and the lens control information is switched according to the location of the contact point attached to the camera. Yes.

  According to the present invention, it is possible to correctly control the lens using the control information corresponding to the reverse attachment even when the interchangeable lens is reversely photographed.

It is a block diagram showing the camera system of this invention. It is a figure showing the lens mount of the lens mount of this invention, and reverse attachment. It is a figure showing operation | movement of the lens of this invention.

  Hereinafter, the present invention will be described in detail based on illustrated embodiments.

  The configuration of the camera system according to the present invention will be described below. As shown in FIG. 1, the camera system includes a camera body (101) and an interchangeable lens (102). The photographing light flux from the subject passes through the photographing optical system of the interchangeable lens (102), and during the preparation for photographing, a part is reflected by the quick return main mirror (103) whose central portion is a half mirror, and the pentaprism (104). Becomes an erect image. The photographer can confirm the erect image as a subject image in the optical viewfinder (105). The illuminance on the focus plate surface (not shown) is measured by the photometry circuit (106), and the measurement result is input to the camera MPU (107). The camera MPU (107) determines shooting conditions such as exposure time and aperture. The photometric sensor in the photometric circuit (106) is divided into a plurality of areas, and a photometric result for each area can be obtained.

  A sub mirror (108) is disposed on the back surface of the quick return main mirror (103), and the light beam that has passed through the half mirror surface of the quick return main mirror (103) is incident on the distance measuring means (109). The distance measuring means (109) photoelectrically converts the incident light beam and performs signal processing to create distance measurement data, which is input to the camera MPU (107).

  When the photographing operation is started, the quick return main mirror (103) and the sub mirror (108) are retracted toward the pentaprism (104), and the focal plane shutter (110) is driven by the shutter drive circuit (111). Then, the imaging light beam forms an image on the imaging unit (112) surface as an imaging optical image. The captured optical image is photoelectrically converted by the imaging unit (112) into an imaging signal. The imaging unit (112) is controlled by a timing generator (113) for accumulation operation, readout operation, reset operation, and the like. In the imaging signal, accumulated charge noise is reduced by a CDS (double correlation sampling) circuit (114), and the signal is amplified by a gain control circuit (115). Thereafter, the analog / digital image data is converted by the A / D converter (116). The digitized image data is subjected to filter processing, color conversion processing, gamma processing, and the like by the video signal processing circuit (117), and is stored in the buffer memory (118). The image data is displayed on the LCD (119) from the buffer memory (118) or recorded on the removable memory card (120).

  An operation unit (121) is a switch for performing a release at the time of shooting, and various operation switches for setting a shooting mode of a camera, setting a recording image file size, and the like. The camera MPU (107) controls the operation of the camera body (101) and communicates with the lens MPU (126) via the communication terminal (122) on the camera body (101) side. In this communication, a focus drive command is transmitted to the interchangeable lens (102), and data such as operation states and optical information in the camera body (101) and the interchangeable lens (102) are transmitted and received.

  The interchangeable lens (102) is provided with a focus lens (129), a zoom lens (130), an image blur correction lens (131), and a diaphragm (139) as a part of the photographing optical system. The focus lens (129) is driven via the focus control circuit (132) by a control signal from the lens MPU (125). In addition to the focus lens drive circuit, the focus control circuit (132) includes a focus lens drive motor, a focus encoder that outputs a zone pattern signal and a pulse signal according to the movement of the focus lens, and the like. The subject distance can be detected by this focus encoder.

  The zoom lens (130) moves when the photographer operates a zoom operation ring (not shown). The zoom encoder (133) outputs a zone pattern signal corresponding to the movement of the zoom lens. The photographic image magnification is obtained by the lens MPU (125) reading signals from the focus encoder and zoom encoder (133) and reading out pre-stored photographic image magnification data based on a combination of subject distance and focal length.

  The image blur correction lens (131) is driven via an image blur correction control circuit (134). Image blur correction is performed as follows. First, a shake signal of an angular velocity sensor (136) that detects rotational shake is signal-processed by a signal processing circuit (137) and input to a lens MPU (125). Next, the lens MPU (125) calculates a correction lens drive target signal, and image blurring a drive signal corresponding to the difference between the correction lens drive target signal and the correction lens position signal output from the correction lens encoder (135). Output to the correction control circuit (134). Image blur correction is performed by feeding back the correction lens position signal output from the correction lens encoder (135) to the image blur correction control circuit (134). Note that the above-described image blur correction control is performed on each of the two axes, the pitch axis for detecting the vertical tilt and the yaw axis for detecting the horizontal tilt, with the camera body (101) as the center.

  The diaphragm (139) is driven via the diaphragm control circuit (138) by a control signal from the lens MPU (125). The interchangeable lens (102) is connected to the camera body (101) using the lens mount 1 (123) and the lens mount 2 (128) for reverse attachment. The lens mount 1 (123) and the reverse lens mount 2 (128) are provided with a lens side communication terminal 1 (124) and a lens side communication terminal 2 (126), respectively, and a camera side communication terminal (122). The lens MPU (126) and the camera MPU (107) can exchange information with each other via the. The lens mount 2 (128) is provided with a detection switch (127) for reverse mounting, and the lens MPU (126) has a lens mount 1 (123) or a lens mount 2 (128) on either side. It is possible to determine whether the main body (101) is connected.

  2A is a view of the lens mount 1 (123) viewed from the side indicated by A in FIG. 1, and FIG. 2B is a lens mount for reverse mounting viewed from the side indicated by B in FIG. 2 (128). FIG. 2A shows a mount used during normal photographing, and a communication terminal 1 (124) is provided on the mount. FIG. 2B shows a mount used for attaching the lens to the camera in the reverse direction. The mount is provided with a communication terminal 2 (126) and a switch (127) for detecting reverse attachment. This switch consists of two metal terminals, which are electrically connected to the lens MPU (125). Normally, this metal terminal is non-conductive and is in an OFF state, but when attached to the camera mount, the two terminals are made conductive by the camera mount and turned ON, and the lens MPU (125) determines the attachment state. I can do things.

  FIG. 3 is a flowchart showing the operation of the lens MPU (125) when the lens (102) is connected to the camera body (101). The operation is described below.

  First, in step # 301, when the lens (102) is connected to the camera body (101), power is supplied from the camera, and the lens MPU (125) starts operating.

  In step # 302, the lens MPU (125) detects the state of the reverse detection switch (127). When the lens mount 1 (123) side is attached to the camera body (101), the terminals of the reverse detection switch (127) are in a non-conducting state, so it is determined to be OFF, and the lens mount 2 (128) side is the camera body. When attached to (101), it is determined to be ON.

  If it is determined in step # 302 that it is OFF, the process proceeds to step # 303. At this time, since normal shooting is performed, selection is performed so as to use the lens control information of the normal setting. If it is determined in step # 302 that it is ON, that is, if the lens is reversed, the process proceeds to step # 304. In this state, selection is made to use lens control information different from the normally set lens control information. Specifically, the drive direction of the focus lens (129) is reversed with respect to the lens control information set normally, or the camera is notified of control information according to the optical characteristics when reversed. . After completing these initial settings, communication with the camera body (101) is started in step # 305.

  According to the above embodiment, the lens (102) can determine the lens mount attached to the camera and control the lens using the control information suitable at that time. It is possible to control the lens using correct control information such as focus.

  In this embodiment, an attachment detection switch that electrically detects the attachment state is described. However, a mechanical switch that has a protrusion on the lens mount and is pressed when connected to the camera mount may be used. .

  Alternatively, a switch may be mounted on the normal lens mount side so that when the switch on one side is ON, the switch on the other side and the communication terminal are disabled.

  Further, it may be configured not to have a mount for reverse mounting but to have only electronic contacts and to be attached to the camera via an adapter for reverse mounting.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

101 camera body, 102 interchangeable lens, 123 lens mount,
124 Lens side communication terminal 1, 126 Lens side communication terminal 2,
127 Reverse detection switch, 128 Reverse lens mount

Claims (2)

A lens having contact points with a camera at a plurality of locations, having lens control information according to the location of the contact point attached to the camera, and switching the lens control information according to the location of the contact point attached to the camera. Interchangeable lens. A lens having contact points with a camera at a plurality of locations, having lens control information according to the location of the contact point attached to the camera, and switching the lens control information according to the location of the contact point attached to the camera. Camera system.