JP5850669B2 - Detection means holding device and optical device provided with the same - Google Patents

Description

  The present invention relates to a holding mechanism for detecting means, and more particularly to a position adjusting mechanism for detecting means.

  Patent Document 1 discloses that a part of a holding mechanism that holds a detection unit for detecting a focus state has an adjustment mechanism that can adjust the position (angle) of the detection unit in two different directions. ing. In Patent Document 1, a main body block having curved surfaces with different curvatures in two adjustment directions and a detection means holding member having two spherical surfaces having the same curvature in the longitudinal direction are abutted at two locations in the longitudinal direction. It is disclosed to adjust the position of the detection means.

Japanese Patent No. 4250235

  The problem in the prior art disclosed in Patent Document 1 will be described with reference to FIGS. 4 and 5. FIG. 4A is an exploded perspective view focusing on the adjustment mechanism of the detection means holding mechanism of Patent Document 1. FIG. FIG. 4B is a cross-sectional view in the longitudinal direction of the adjustment mechanism of the detection means holding mechanism of Patent Document 1. FIG. 5A is a diagram schematically showing a cross-sectional view in the longitudinal direction of the adjustment mechanism of the detection means holding mechanism disclosed in Patent Document 1, and shows an ideal state where tilt adjustment is unnecessary. FIG. 5B is a diagram schematically showing a cross-sectional view in the longitudinal direction of the adjusting mechanism of the detection means holding mechanism of Patent Document 1, and shows a state when tilted for tilt adjustment.

  In the prior art disclosed in Patent Document 1, as shown in FIG. 4, the main body block 250 having curved surfaces with different curvatures in two directions supports the detection means support member 200 at two locations in the longitudinal direction. Here, reference numeral 220 denotes a sensor as detection means, and 210 denotes a sensor holder for holding the sensor 220. The sensor 220 and the sensor holder 210 are held by the main body block 250 via the detection means support member 200. In this configuration, the contact portions on the two surfaces having different curvatures are in a linear contact, and the distance between the surfaces is increased in the vicinity of the contact portion, so that it is easily affected by the shape error. Moreover, there existed a subject that position stability was bad because of the contact in a linear form. Further, in the vicinity of the contact part, since a large inter-surface distance is adhered, it has a characteristic sensitive to reliability in an environment after adhesion.

  Further, in this configuration, in order to support in the longitudinal direction, as shown in FIG. 5A, the longitudinal rotation center of the detection means supporting member 200 (the center of the curved surface in the longitudinal direction of the main body block 250) and the sensor 220 are arranged. It is difficult to match the center 222 of the detection surface. Therefore, as shown in FIG. 5B, when the tilt adjustment of the sensor 220 is performed, there is a problem that the center position of the sensor 220 is shifted.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a detection means holding mechanism that improves the positional stability of the detection means and prevents positional deviation when the position of the detection means is adjusted.

According to another aspect of the present invention, there is provided a detection means holding device , a detection means for detecting a subject image and detecting a focus state , a longitudinal direction and a short direction, a first abutting surface, and the detection means . a detecting means support member for holding, and a main body block having a second abutment surface corresponding to the first abutment surface of said detecting means support member, the first pick of the previous SL detector support member The contact surface is formed at two locations in the short direction of the detection means support member, and the first contact surface of the detection means support member and the second contact surface of the main body block are the same. Or it is formed in the spherical shape of the near curvature radius, and is mutually contacting planarly .

  ADVANTAGE OF THE INVENTION According to this invention, while improving the position stability of a detection means, the detection means holding | maintenance mechanism which prevents the position shift at the time of position adjustment of a detection means can be provided.

It is a disassembled perspective view of the focus detection apparatus which concerns on embodiment of this invention. It is a disassembled perspective view which paid its attention to the adjustment part of the detection means holding mechanism which concerns on this invention among the focus detection apparatuses which concern on embodiment of this invention. It is sectional drawing in a transversal direction among the adjustment parts of the detection means holding mechanism of this invention. FIG. 4A is an exploded perspective view focusing on the adjustment portion of the detection means holding mechanism in the conventional focus detection device. FIG. 4B is a cross-sectional view in the longitudinal direction of the adjustment portion of the detection means holding mechanism in the conventional focus detection apparatus. It is the figure which represented typically sectional drawing of the longitudinal direction of the adjustment part of a detection means holding | maintenance mechanism among the conventional focus detection apparatuses.

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

  FIG. 1 is an exploded perspective view of a focus detection apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a field cover for separating a distance measuring light beam and removing an unnecessary light beam, and 20 denotes a field mask serving as a mask for separating the distance measuring light beam and removing an unnecessary light beam. A field lens 30 guides an image to be formed on the primary imaging plane to the sensor. Reference numeral 40 denotes a light shielding plate for separating the luminous flux in the central ranging field and the luminous flux in the peripheral ranging field and preventing the luminous flux other than the effective luminous flux corresponding to each ranging field from entering the sensor 120. Reference numeral 60 denotes a mirror of a surface mirror for bending a focus detection light beam incident on a focus detection apparatus capable of detecting the focus state of a plurality of distance measuring fields toward the sensor 120. Reference numeral 70 denotes an infrared cut filter for removing infrared light.

  Reference numeral 80 denotes a perforated diaphragm for separating the focus detection light beam. Reference numeral 90 denotes a re-imaging lens which is an optical member having a plurality of pairs of lenses for forming an image on the sensor 120, and has a pair of positioning dowels. Reference numeral 100 denotes a detection means support member (sensor support member) for adjusting the inclination of the sensor as the detection means. As will be described later, the sensor support member 100 is provided between the sensor 120 and the main body block 50 and holds the position of the sensor 120 with respect to the main body block 50 so as to be adjustable. Reference numeral 110 denotes a sensor holder for holding a sensor as a detection means. Reference numeral 120 denotes a sensor that is a detection unit that detects a subject image and detects a focus state, and a plurality of pairs of line sensors that detect an image are formed.

  Reference numeral 50 denotes a main body block which is a holding member that holds each component constituting the focus detection device and shields external light. Reference numeral 140 denotes an adjustment plate which is a position adjustment member when attached to the imaging apparatus. An adjustment cam 130 is a position adjustment member when the focus detection device is attached to the adjustment plate 140.

  Next, the holding structure of each component in the above configuration will be described.

  The main body block 50 includes a field cover 10, a field mask 20, a field lens 30, a light shielding plate 40, a mirror 60, an infrared cut filter 70, a porous aperture 80, a re-imaging lens 90, a sensor support member 100, and an adjustment cam 130. It is attached. Further, the field cover 10 and the field mask 20 are positioned by the fitting shaft and the fitting hole and fixed to the main body block 50. The field lens 30 is bonded to the main body block 50, and the light shielding plate 40, the mirror 60, and the infrared cut filter 70 are positioned and fixed to the main body block 50. The main body block 50 can hold the sensor 120 via the sensor support member 100 as will be described later.

  The porous aperture 80 is positioned and fixed with respect to the re-imaging lens 90 by using a plurality of positioning dowels provided in the re-imaging lens 90 due to the hole and the long hole shape provided in the porous aperture 80. The re-imaging lens 90 is positioned and fixed by a positioning hole provided in the main body block 50 and a positioning dowel of the re-imaging lens. The re-imaging lens 90 and the main body block 50 are fixed so as to sandwich the perforated diaphragm 80 so that the perforated diaphragm 80 is not displaced with respect to the main body block 50 and the re-imaging lens 90.

  The sensor 120 is bonded and fixed to the sensor holder 110 in advance, and the tilt adjustment with respect to the main body block 50 is performed as an integrated sensor unit 1200. The sensor unit 1200 is held with respect to the main body block 50 via the sensor support member 100. Sensor tilt adjustment with respect to the focus detection device is performed between the main body block 50 and the sensor support member 100, and the sensor unit 1200 is bonded and fixed to the sensor support member 100 after various adjustments are completed.

  The sensor support member 100 is positioned with respect to the main body block 50 by a substantially spherical positioning adjustment portion (main body block abutting portion, abutting surface) 101 provided in the short direction of the sensor support member as will be described later. ing. For this reason, the sensor support member 100 enables tilt adjustment of a plurality of axes with respect to the main body block 50. In the following description, descriptions of spherical shape, identical, and coincidence are concepts including substantially spherical shape, substantially identical, and substantially coincidence. Here, “substantially (substantially)” is a concept including an error within an allowable range.

  The adjustment cam 130 enables adjustment of the inclination of the adjustment plate 140 and the main body block 50 by rotation of the cam shape, and is bonded and fixed after the adjustment is completed.

  Next, the configuration of the adjustment unit of the detection unit holding mechanism will be described with reference to FIGS.

  FIG. 2 is an exploded perspective view focusing on the adjusting portion of the detection means holding mechanism according to the present invention in the focus detection apparatus according to the embodiment of the present invention. 2A is a view from the detection means side, and FIG. 2B is a view from the main body block side. FIG. 3 is a cross-sectional view of the adjustment unit of the detection means holding mechanism according to the present invention, out of the focus detection apparatus according to the embodiment of the present invention. FIG. 3A is a cross-sectional view in the short direction when tilt adjustment is not necessary, and FIG. 3B is a cross-sectional view in the short direction when tilt adjustment is performed.

  2 and 3, the sensor holder 110 and the sensor 120 are bonded and fixed in advance, and the position and inclination of the sensor 120 are adjusted as an integrated sensor unit 1200. By adjusting in this way, the holding shape of the tool can be added to the sensor.

  A body block butting portion (butting surface) 101 as shown in FIG. 2B is added to a portion corresponding to the butting surface 51 of the main body block 50 in the short direction of the sensor support member 100.

  Reference numeral 50 denotes a main body block, and a sensor support member butting portion (butting surface) 51 is provided in a portion corresponding to the main body block butting portion 101 of the sensor support member 100 in the short direction of the main body block 50. .

  The abutting surface 51 of the main body block 50 and the abutting surface 101 of the sensor support member 100 are formed in the short direction so that the shape thereof is substantially spherical, and the approximate center of the spherical surface is the center of the detection surface 121 (the center of the detection surface 121 of the sensor 120). Position). With this configuration, the angle adjustment can be performed in a plurality of directions without causing a shift of the center position of the sensor detection surface, and a highly accurate angle adjustment can be performed without correcting the position shift. . In addition, since both the abutting surface 51 and the abutting surface 101 are spherical surfaces having the same or close curvature radius, the contact surface 51 and the abutting surface 101 can be planar contact, and the contact area can be increased. The positional stability of can be improved.

  Further, the abutting surface 51 of the main body block 50 and the abutting surface 101 of the sensor support member 100 are constituted by a plurality of curved surfaces (that is, two places in the short direction). This configuration makes it possible to stably hold the sensor support member without excessively increasing the contact area while the abutting surfaces (51, 101) are planar contacts, and reduce the frictional force during adjustment. It becomes possible to make it.

  Thus, according to the present invention, the abutting surface 51 of the main body block 50 and the abutting surface 101 of the sensor support member 100 are formed at two locations in the short direction of the sensor support member, and the curvatures are the same or close to each other. It is formed in a spherical shape with a radius. With this configuration, in adjusting the angle of the sensor, the abutting surfaces (51, 101) are brought into contact with each other in a planar shape, and the distance between the surfaces at the contact portion becomes extremely small, so that it is difficult to be affected by the shape error. Moreover, since the contact is made in a planar shape, the positional stability of the sensor can be improved. Further, both the abutting surface 51 and the abutting surface 101 have spherical surfaces with substantially the same radius of curvature, and the center of the spherical surfaces is configured to be substantially the same as the center of the sensor detection surface. High-accuracy angle adjustment is possible without correcting the deviation. Moreover, since the inter-surface distance at the contact portion of the abutting surface (51, 101) becomes small, it is possible to provide an adjustment mechanism that is excellent in reliability in an environment after bonding.

  Further, the abutting portion 51 of the main body block 50 has a concave shape obtained by cutting a part of a spherical shape having a certain radius, and the abutting portion 101 of the sensor support member 100 is substantially the same as the abutting portion 51. It has a convex shape that forms a part of a spherical shape with a radius. With this configuration, since the sensor support member 100 can be formed thick, the strength of the sensor support member 100 is increased, and the change in state during adjustment can be minimized, so that the detection state of the sensor can be stabilized. Is possible.

  Reference numeral 102 denotes a rotation restricting portion of the sensor support member 100, and reference numeral 52 denotes a sensor support member rotation restricting portion of the main body block 50. As shown in FIG. 3B, the sensor support member rotation restricting portion 102 and the sensor support member rotation restricting portion 52 come into contact with each other, so that the sensor support member 100 cannot be rotated more than necessary.

  With this configuration, even if the re-imaging lens 90 exists between the main body block 50 and the sensor support member 100, the sensor support member 100 can be prevented from touching the re-imaging lens 90. It becomes.

  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. For example, the focus detection device described in the above embodiments may be applied to an optical device such as a video camera, a compact camera, or a single-lens reflex camera.

  In the above embodiment, the sensor holder 110 and the sensor support member 100 are separate members, but the present invention is not limited to these separate members. In the above-described embodiments, the holding mechanism that holds the AF sensor 120 is described as an example regarding the focus detection device. However, the present invention is not limited to this, and for example, an AE sensor (automatic detection) that detects (photometrically) a subject image. The present invention may be applied to a holding mechanism that holds an exposure sensor).

  The detection means holding mechanism of the present invention can be suitably used for an optical apparatus such as a video camera, a compact camera, or a single-lens reflex camera.

50 Main body block 51 Abutting surface 100 of main body block Sensor support member 101 Abutting surface 120 of sensor support member Sensor

Claims (6)

Detecting means for detecting a subject image and detecting a focus state ;
A detection means support member having a longitudinal direction and a short direction, having a first abutting surface, and holding the detection means;
A main body block having a second abutting surface corresponding to the first abutting surface of the detection means support member ,
The first abutment surface before Symbol detector supporting member is formed in two places in the lateral direction of the detector support member,
The first abutting surface of the detection means supporting member and the second abutting surface of the main body block are formed in spherical shapes having the same or near curvature radius , and are in surface contact with each other. Detection means holding device . The second abutment surface of the first abutment surface and the body block before Symbol detector support member, according to claim 1, each of which is characterized by being formed on the same radius of curvature of the spherical shape Detecting means holding device . The first abutment surface and the center of the spherical shape of the second abutment surface of the body block, claim, characterized in that it has the same as the center of the detection surface of the detection means before Symbol detector support member The detection means holding device according to 1 or 2. The body block, detection means according to claim 1, characterized in that the body block for holding a component detectable focus detection device the focus state of a plurality of distance measuring visual field Holding device . The angle adjustment between the main body block and the detection means support member is performed, and then the detection means, the detection means support member, and the main body block are bonded and fixed. Item 5. The detection means holding device according to any one of Items 1 to 4. An optical device comprising the detection means holding device according to any one of claims 1 to 5 .