JP2020056852A - Imaging device - Google Patents

Abstract

To improve convenience of an imaging device of interchangeable lens type equipped with a converter lens optical system inside of a mount adapter.SOLUTION: An imaging device comprises: a mount to which an interchangeable lens is attachable and removable; a mounting substrate on which an imaging element is mounted; an optical unit composed of one or a plurality of optical components and a holding member for holding these; an optical unit holding member equipped with an optical unit holding part for holding the optical unit; and a base member equipped with an attachment part for attaching each of the lens mount, the mounting substrate and the optical unit holding member. The lens mount and the mounting substrate are held at a position facing each other across the base member, and the optical unit holding member is located between the base member and the mounting substrate, and the optical unit holding part protrudes to a lens mount side through an open hole provided in the base member, with the optical unit held to the optical unit holding part by holding means from a lens mount side.SELECTED DRAWING: Figure 1a

Description

  The present invention relates to an image pickup device of an interchangeable lens type.

  In an interchangeable lens type image pickup device, by providing a converter lens optical system consisting of a plurality of lenses in the mount adapter, the size of the image sensor on the camera body side can be reduced even when lenses with different image circles and mount standards are mounted. On the other hand, a system for appropriately reducing or enlarging an image has been proposed (Patent Document 1). That is, according to the mount adapter disclosed in Patent Document 1, by using the mount adapter, it is possible to generate a subject image at an angle of view obtained by a lens original system of a mount standard having a different image circle. Become.

  At this time, the converter lens optical system needs to perform optical adjustment for correcting the position and the inclination of the mount adapter and the imaging element.

  Generally, the optical adjustment is performed while confirming the shooting resolution of a predetermined subject in real time through the image sensor, so that it is necessary to always perform the optical adjustment in a state where the subject is reflected. Therefore, a mechanism that can perform optical adjustment from a direction other than the object side is required.

JP 2012-063778 A

  In the interchangeable lens-type imaging device having the converter lens optical system in the mount adapter described above, the converter lens optical system is unitized to be detachable from the subject side, so that the unit can be replaced when a converter lens trouble occurs. Further, dust generated in the optical path can be easily removed, and the convenience can be greatly improved.

  However, for this purpose, there is a problem that a unit that can be detached from the subject side and a mechanism that can perform optical adjustment from a direction other than the subject side as described above must be compatible.

  ADVANTAGE OF THE INVENTION This invention improves the convenience in the interchangeable-lens type imaging device which has a converter lens optical system in a mount adapter by making a converter lens unit detachable from a to-be-photographed object side, and being adjustable from directions other than a to-be-photographed object side. The purpose is to let them.

In order to achieve the above object, an imaging device according to the present invention includes:
An optical unit including a mount on which an interchangeable lens is detachable, a mounting board on which an image sensor is mounted, one or more optical components and a holding member for holding the optical components, and an optical unit for holding the optical unit. An optical unit holding member having an optical unit holding portion, and a base member having an attachment portion for attaching the lens mount, the mounting substrate, and the optical unit holding member, respectively, wherein the lens mount and the mounting substrate are provided. Are held at positions facing each other across the base member, the optical unit holding member is located between the base member and the mounting board, and the optical unit holding portion is provided in a through hole provided in the base member. Projecting toward the lens mount through the optical unit, the optical unit Characterized by comprising a structure that is held by the holding means from the lens mount side.

  According to the present invention, the optical adjustment can be performed from a direction other than the subject side, and the optical unit can be attached and detached from the subject side. Therefore, in an interchangeable lens type imaging apparatus including a converter lens optical system in a mount adapter. Convenience can be improved.

Exploded perspective view showing the configuration of the first embodiment. Exploded perspective view showing the configuration of the first embodiment. Exploded perspective view showing the configuration of the first embodiment. FIG. 2 is a perspective view showing the configuration of the first embodiment. FIG. 3 is an exploded perspective view when the sensor substrate is further attached from the state of FIG. FIG. 3 is an exploded perspective view when the sensor substrate is further attached from the state of FIG. 3 is a perspective view after the sensor substrate is further attached from the state of FIG. Rear view after further mounting the sensor board from the state of FIG. Detailed view when performing optical adjustment in the configuration of the first embodiment Detailed view when performing optical adjustment in the configuration of the first embodiment 1 is a perspective view of the entire imaging apparatus to which the first embodiment is applied. FIG. 8A is a perspective view showing a state in which an interchangeable lens is further attached to the imaging device shown in FIG. 8A. Detailed view of the eccentric roller in the second embodiment Exploded perspective view showing the configuration of the second embodiment. Exploded perspective view showing the configuration of the second embodiment. Partial enlarged view around the eccentric roller Perspective view showing the configuration of the second embodiment. Detailed view when performing optical adjustment in the configuration of the second embodiment Detailed view when performing optical adjustment in the configuration of the second embodiment

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each of the drawings, the same members are denoted by the same reference numerals, and redundant description will be omitted.

  Also, in all the figures, the XYZ coordinate system in the figures indicates which direction each figure is oriented. For example, in each figure, the + Z direction indicates the same direction in the absolute coordinate system. Shall be. The Z axis indicates the optical axis.

  1a, 1b, and 3 are an exploded perspective view and an assembled view, respectively, showing the configuration of the first embodiment of the present invention.

  The rear base 302 is attached to the front base 301 from the -Z direction. At this time, the coil springs 306a to 306c are first fitted into the outer shapes of the bosses 309a to 309c, and are charged and sandwiched between the front base 301 and the rear base 302. Is done. When the rear base 302 is assembled, the bosses 303a to 303d provided on the rear base 302 are inserted into the through holes 304a to 304d of the front base 301 as shown in FIG. It protrudes in the + Z direction. From this state, the adjustment screws 307a to 307c are fastened to the bosses 309a to 309c through the screw holes 308a to 308c provided in the rear base 302, whereby the rear base 302 is supported by the front base 301.

  The lens unit 200 is attached from the + Z direction of the front base 301.

  The lens unit 200 is composed of a plurality of lenses and a holding member for holding the lenses, and is unitized in a state where the optical adjustment of the unit alone has been performed. The detailed internal structure of the lens unit 200 is omitted.

  When assembling the lens unit 200, first, elastic members 312a to 312d, which are dustproof sponges, are formed between the lens unit 200 and the front base 301 and between the bosses 303a to 303d and the through holes 304a to 304d. It is arranged to close the gap. Thereafter, the lens unit 200 is fastened to the bosses 303a to 303d, which project the screws 310a to 310d through the screw holes 311a to 311d and the + Z direction from the above-described seating surface 305, so that the lens unit 200 is Fixed. Further, the front base 301 is further provided with an opening 317 through which incident light from the + Z direction passes, and bosses 318a to 318c for attaching a sensor substrate described later.

  Next, a state in which a sensor is further attached to the above configuration will be described.

  4A and 4B are exploded perspective views of the sensor unit 600 before being assembled to the front base 301, and FIG. 5 is an assembly diagram after the sensor unit 600 is assembled to the front base 301.

  The sensor unit 600 includes a sensor 601, a sensor substrate 602, and a sensor mounting plate 603.

  The sensor mounting plate 603 is provided with an opening 604 larger than the sensor 601, and the sensor substrate 602 on which the sensor 601 is mounted passes the sensor 601 from the −Z direction through the opening 604 of the sensor mounting plate 603. After that, the sensor 601 is fixed to the metal plate 603 by bonding the periphery of the sensor 601 and the opening 604. The sensor unit 600 is fixed to the front base 301 with screws by fastening the sensor mounting screws 605a to 605c to the bosses 318a to 318c of the front base 301 through the screw holes 606a to 606c of the sensor mounting plate 603. Is done. FIG. 6 is a rear view after the sensor unit 600 is assembled to the front base 301 (the front side in the drawing is the −Z direction).

  As can be seen from this, the adjusting screws 307a to 307c are arranged so as to be exposed from the −Z direction even when the sensor unit 600 is assembled. This is to enable optical adjustment from the -Z direction even when the sensor unit 600 is attached. Details will be described later.

  Next, a method of optically adjusting the lens unit 200 from the states shown in FIGS. 5 and 6 will be described. FIG. 7A is a partially enlarged view of an AA cross section of FIG. The rear base 302 receives a biasing force in the −Z direction by the coil spring 306b in the state of FIG. 7A. When the adjustment screw 307b is loosened in this state, the rear base 302 is also pushed up by that amount by the urging force of the coil spring 306b, and tilts in the D direction about the portion (axis M) supported by the adjustment screw 307a and the adjustment screw 307c. Occurs, resulting in a state as shown in FIG. 7b. At this time, when the rear base 302 is tilted, the lens unit 200 fastened to the rear base 302 by the screws 310a to 310d is also tilted in the D direction.

  Similarly, when the adjusting screw 307a and the adjusting screw 307c are loosened, the rear base 302 is tilted correspondingly by the urging force of the coil springs 306a and 306c, and the lens unit 200 is also tilted along with the tilting. As described above, by adjusting the slack amounts of the adjustment screws 307a to 307c, the rear base 302 and the lens unit 200 can be adjusted to arbitrary positions and postures.

  In the present embodiment, the optical adjustment has been described only in the direction in which the adjustment screws 307a to 307c are loosened. However, when the rear base 302 is assembled to the front base 301, the optical adjustment is made to float on the bosses 318a to 318c in advance, that is, By making the adjustment screws 307a to 307c not to be tightened until they come into contact with each other and performing optical adjustment therefrom, it is also possible to perform adjustment in the direction in which the adjustment screws 307a to 307c are tightened.

  Also, the aforementioned elastic members 312a to 312d are sufficiently charged in a built-in state so that no gap is formed between the bosses 303a to 303d and the through holes 304a to 304d, regardless of how the lens unit 200 is moved by the optical adjustment. It is assumed that

  Lastly, the entire imaging device of the present invention including the above-described configuration will be described.

  FIG. 8A shows an overall image of the imaging apparatus main body 100 according to the embodiment of the present invention, and FIG. 8B shows a state where the interchangeable lens 101 is attached to the imaging apparatus main body 100.

  A bayonet-type mount unit 800 for attaching the interchangeable lens 101 to the image pickup apparatus main body 100 of an interchangeable lens type, and an unillustrated provided on the interchangeable lens 101 when the interchangeable lens 101 is attached to the mount unit 800. It has a mount pin 103, an operation button 104, and a lens unit 200 that engage with the concave shape to stop rotation. The mount unit 800 is attached to the imaging device main body 100 by screws 811a to 811d. The mount pin 103 is protruded in the + Z direction from the lens mounting surface 801 of the mount unit 800 by an elastic member (not shown). When the operation button 104 is pushed in the −Z direction, the operation button 104 is moved in the −Z direction in conjunction therewith. Is possible. Therefore, by pressing the operation button 104 and moving the mount pin 103 in the −Z direction in a state where the interchangeable lens 101 is attached to the mount unit 800 as shown in FIG. The engagement with the concave shape can be released, and the interchangeable lens 101 can be removed from the mount unit 800. Since the bayonet type is known, its description is omitted. The lens unit 200 is mounted inside the diameter of the mount unit 800, and can be removed in the + Z direction by removing the screws 310a to 310d.

  As described in the first embodiment, by applying the present invention, the optical adjustment can be performed from a direction other than the subject side, and the optical unit can be attached and detached from the subject side. It is possible to improve the convenience in an interchangeable lens type image pickup apparatus having a converter lens optical system therein.

  Next, a second embodiment of the present invention will be described. The description of the same configuration as that of the first embodiment will be omitted. FIG. 9 is a detailed view of the eccentric roller 904a in the second embodiment.

  The eccentric roller 904a has a shaft portion 907 having a cylindrical shape around the axis P, a screw hole 912 and a screw seat 908 concentric with the shaft portion 907, and a shaft eccentric with respect to the center axis of the shaft portion 907. An eccentric shaft portion 909 having a cylindrical shape, slit grooves 910a to 910c, and an abutting surface 919 that contacts a roller seat described later.

  10a and 10b are exploded perspective views showing the configuration of the second embodiment of the present invention, and FIG. 11 is an enlarged view around the eccentric roller 904a shown in FIG. 10a. The eccentric rollers 904b and 904c have the same shape as the eccentric rollers 904a.

  The rear base 902 in the second embodiment is adjacent to the guide grooves 903a to 903c whose longitudinal directions are parallel to the optical axis and the guide grooves 903a to 903c, and the contact surfaces 919a to 919a of the eccentric rollers 904a to 904c in the assembled state. Roller seats 923a to 923c that are in contact with 919c are provided at three positions at equal angles. The shaft portion 907 of the eccentric roller 904a is fixed to a boss 905a provided on the front base 901 by a screw 916 in a state where the shaft portion 907 is fitted with the short direction of the guide groove 903a. At this time, the screw portion 916a passes through the screw hole 912 and is screwed, and the screw head 916b contacts the screw seat 908.

  The eccentric rollers 904b and 904c are also fixed to the front base 901 by the same attachment as the eccentric rollers 904a.

  As in the first embodiment, the lens unit 200 is attached to the bosses 913a to 913c in which the screws 310a to 310d pass through the screw holes 311a to 311d and protrude from the seating surface 915 of the front base 901 in the + Z direction. Is fixed to the rear base 302.

  12 is a view after the assembly of FIGS. 10a and 10b, and FIG. 13a is a partially enlarged view of FIG.

  In the state of FIG. 13A, when the eccentric roller 904a is rotated in the E direction using a tool (not shown) adapted to the slit grooves 910a to 910c, the eccentric roller 904a rotates about the axis P, As shown in FIG. 13B, the rear base 902 is pushed by the eccentricity (distance S) of the outer shape of the eccentric shaft 909 and moves in the F direction. The movement at this time is a rotational movement about the part fixed by the eccentric rollers 904b and 904c. Then, as in the first embodiment, the lens unit 200 tilts with the movement of the rear base 902. Similarly, by rotating the eccentric rollers 904b and eccentric rollers 904b, the rear base 902 is tilted correspondingly, and the lens unit 200 is also tilted with it. As described above, the eccentric rollers 904a to 904c can be used to adjust the rear base 902 and the lens unit 200 to arbitrary positions and postures. The optical adjustment by rotating the eccentric rollers 904a to 904c described above can be performed not only in the E direction but also by rotating the eccentric rollers 904a to 904c in a direction opposite to the E direction.

  As described above, by applying the second embodiment of the present invention, as in the first embodiment, a unit detachable from the subject side and a mechanism capable of performing optical adjustment from a direction other than the subject side are compatible. Further, it is possible to improve the convenience in an interchangeable lens type imaging apparatus having a converter lens optical system in a mount adapter. Furthermore, since the lens unit can be adjusted from the radial direction, unlike the first embodiment, there is no problem even if the adjustment unit and the sensor substrate are projected on the optical axis direction, so that a configuration with higher flexibility is possible. Becomes

  As described above, the present invention has been described in detail based on the preferred embodiments. However, the present invention is not limited to these specific embodiments, and various forms that do not depart from the gist of the present invention are also included in the present invention. included. A part of the above-described embodiments may be appropriately combined.

100 imaging device main body, 101 interchangeable lens, 103 mount pin,
104 operation buttons, 200 lens unit

Claims (5)

A mount on which an interchangeable lens can be attached and detached, a mounting board on which an image sensor is mounted,
An optical unit including one or more optical components and a holding member for holding the optical components,
An optical unit holding member having an optical unit holding portion for holding the optical unit, and a base member having an attaching portion for attaching the lens mount, the mounting board, and the optical unit holding member, respectively,
The lens mount and the mounting board are held at positions facing each other across the base member,
The optical unit holding member is located between the base member and the mounting board, and the optical unit holding portion projects toward the lens mount through a through hole provided in the base member, and the optical unit is An imaging apparatus comprising: a structure that is held by the holding unit from the lens mount side with respect to the optical unit holding unit. Further comprising an elastic member disposed between the base member and the optical unit holding member,
The imaging apparatus according to claim 1, wherein the optical unit holding member is urged toward the mounting board by the elastic member.   The optical unit holding member is supported by being screwed to the base member from the mounting board side, and the screwed portion of the optical unit holding member is in a state where the mounting board is attached. The imaging device according to claim 1, wherein the imaging device is disposed at a position exposed from an optical axis direction. A mount on which an interchangeable lens can be attached and detached, a mounting board on which an image sensor is mounted,
An optical unit including one or more optical components and a holding member for holding the optical components,
An optical unit holding member for holding the optical unit, and an optical unit holding member provided with a plurality of guide grooves along the outer circumference, the longitudinal direction of which is parallel to the optical axis; An eccentric roller and a base member having an attachment portion for attaching the lens mount, the mounting board, the optical unit holding member, and the eccentric roller, respectively,
The lens mount and the mounting board are held at positions facing each other across the base member,
The optical unit holding member is located between the base member and the mounting board, and the optical unit holding portion projects toward the lens mount through a through hole provided in the base member, and the optical unit is The optical unit holding member and the optical unit are held by holding means from the lens mount side with respect to the optical unit holding portion, and the optical unit holding member and the optical unit are moved along the optical axis direction by rotating the eccentric roller. An imaging device, comprising:   5. An elastic member charged between the optical unit and the base member to close a gap after the optical unit mounting portion passes through the through hole. 6. 2. The imaging device according to claim 1.