JP2013157849A - Lens device and imaging device including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens device capable of performing tilting adjustment without using a spring, and an imaging device including the lens device.SOLUTION: A lens device 20 according to the present invention includes a lens barrel 21 that accommodates a lens 22, and an imaging element 41 that is attached to the lens barrel by screwing with a packing 30 made of elastic resin interposed therebetween. The packing has a tilting adjustment member 35 formed integrally therewith that urges the imaging element in a direction separating from the lens barrel.

Description

  The present invention relates to a lens apparatus capable of adjusting the tilt of an image sensor and an image pickup apparatus including the lens apparatus.

  There is known a digital camera that converts an image signal obtained by an image sensor such as a CCD or CMOS into digital image data and stores it in a display or a memory.

  In this type of digital camera, the image sensor must be attached to the lens barrel so that the center of the light receiving surface of the image sensor coincides with the optical axis of the lens, and the light receiving surface and the lens optical axis are vertical.

  However, since there are variations in the components such as the image sensor, the lens, and the lens barrel, the light receiving surface of the image sensor may be inclined with respect to the lens optical axis simply by assembling them. For this reason, it is necessary to perform so-called tilt adjustment for adjusting the tilt of the lens barrel that houses the lens.

  The same applies to the flange back, and since there is a variation in the above parts, it is necessary to perform so-called flange back adjustment for adjusting the distance between the imaging element and the lens.

  Therefore, Patent Document 1 discloses a configuration in which a plurality of springs are fitted between the imaging element and the lens barrel, and the imaging element is attached to the lens barrel with a plurality of screws. By adjusting the amount, the tilt adjustment and flange back adjustment (hereinafter collectively referred to as “tilt adjustment”) are performed.

JP 2011-188254 A

However, the imaging device is a very small electronic component, and it is very difficult to mount a plurality of minute springs in order to perform the tilt adjustment. For example, if the springs are entangled when the springs are attached, it is necessary to dispose the springs. In addition, each spring is placed on the lens barrel, or the image sensor is attached to the lens barrel from above the spring. When you do, the spring may fly.
Moreover, using a plurality of springs also leads to an increase in the number of parts.

  Furthermore, there is a case where a small spring has a variation of about 10% in spring strength, and when a plurality of springs are used, it is difficult to adjust the tilt due to the variation. Further, if a spring having a large spring strength is used, there is a risk of buckling.

  An object of the present invention is to provide a lens device that can perform tilt adjustment without using a spring, and an imaging device including the lens device.

The lens device according to the present invention includes:
A lens apparatus comprising: a lens barrel that accommodates a lens; and an imaging element that is attached to the lens barrel by screwing through a packing made of an elastic resin,
A tilt adjusting member that urges the imaging element in a direction away from the lens barrel is integrally formed in the packing.

  According to the lens device of the present invention, the image sensor can be urged by the tilt adjusting member integrally formed with the packing without using a plurality of minute springs as in the prior art. The assembly process of the lens device can be simplified and the number of parts can be reduced.

  In addition, by configuring the tilt adjusting member from an elastic resin such as the same rubber as the packing, it is possible to improve the accuracy of the components as compared with the spring, and it is possible to stably hold the imaging element in the lens barrel.

FIG. 1 is a perspective view of a digital camera equipped with a lens apparatus according to an embodiment of the present invention as viewed obliquely from the front. FIG. 2 is an exploded perspective view of a lens apparatus according to an embodiment of the present invention. FIG. 3 is a partially enlarged cross-sectional view showing a state in which the imaging element unit is attached to the lens barrel.

  An embodiment in which the present invention is applied to a digital camera (10) as an imaging device will be described below.

FIG. 1 shows the external appearance of a digital camera 10 which is an embodiment of the present invention. The digital camera (10) is arranged to expose the lens (22) incorporated in the lens device (20) indicated by the dotted line in the figure on the front side, and the flash unit (11) that emits strobe light, and the shutter button on the top surface (12) Provided with a power button (13), etc.
Although not shown, the back of the digital camera (10) has a display screen such as a liquid crystal display, a viewfinder, a zoom switch, a mode selection switch, and the like, and a battery and a memory slot on the bottom. .

  Inside the digital camera (10), a lens device (20) shown in FIGS. 1 and 2 is housed.

  As shown in FIG. 2, the lens device (20) includes a lens barrel (21) that houses a plurality of lenses (22), (23), and the like, and is attached to the lens barrel (21) via a packing (30). And an image pickup device unit (40) having an image pickup device (41) such as a CCD or a CMOS.

The illustrated lens device (20) exemplifies a lens device of a bending optical system that uses a prism to bend the optical path by 90 degrees in order to reduce the thickness of the digital camera (10).
The lens device (20) is a prism that bends the optical path from the lens (22) inside a resin-made hollow lens barrel (21) with a lens (22) exposed from the digital camera (10) attached to the front surface. 2, a lens unit, a shutter unit, a focus adjustment lens, and a lens (23) as shown in FIG. 2 are housed near the lower end of the lens barrel (21).

  The shutter unit and the focus adjustment lens can be moved in the vertical direction along the optical axis by a motor or the like inside the lens barrel (21).

  A rectangular rim (24) projects from the lower end of the lens barrel (21), and an optical low-pass filter (26) is attached to a recess formed by the rim (24).

On the outer periphery of the rim (24), more specifically, on both sides of the rectangular rim (24) in the longitudinal direction, screw holes (47) for mounting the image sensor unit (40) and adjusting the tilt (47) are fitted ( 27) and a recess (28) for positioning the tilt adjustment member (35) for tilt adjustment of the image sensor unit (40).
In the illustrated embodiment, three screw holes (27) and three recesses (28) are formed, and the recesses (28) are recessed on the rim (24) side of the screw holes (27). .

  Between the lower surface of the lens barrel (21) and the image sensor unit (40), a packing (30) made of an elastic resin such as rubber that prevents intrusion of dust and light is interposed. The packing (30) has an opening (31) that forms a part of the optical path at a position facing the lens (23) of the lens barrel (21), and a lens is formed at the periphery of the opening (31). A groove (32) that can be engaged with the rim (24) is formed on the lens barrel (21) side. The image sensor unit (40) side extends in a rectangular shape, and a reinforcing rectangular rib (33) protrudes from the periphery of the image sensor unit (40) so as to be in close contact with the image sensor unit (40).

  Further, a tilt adjusting member (35) for adjusting the tilt of the image sensor unit (40) is formed on the periphery of the packing (30), more specifically, on both sides in the longitudinal direction of the rectangular packing (30). Yes.

  As shown in FIGS. 2 and 3, the tilt adjusting member (35) can be formed by integral molding with the packing (30). The illustrated tilt adjusting member (35) is composed of three cylindrical members, and the tilt adjusting member (35) is fitted into the recess (28) at the end on the lens barrel (21) side. The image sensor unit (40) side end is formed so as to be in contact with the image sensor unit (40). More specifically, even if the image sensor unit (40) is screwed and tilt adjustment is performed, the tilt adjustment member (35) is elastically deformed by compression, and the recess (28) and the image sensor unit (40) The length is not separated from the distance.

  The packing (30) having the tilt adjusting member (35) has a lens barrel (21) so that the groove (32) is fitted in the rim (24) and the tilt adjusting member (35) is fitted in the recess (28). ).

  As shown in FIGS. 2 and 3, the image sensor unit (40) includes an image sensor (41) such as a CCD or a CMOS, a substrate (42) electrically connected to the image sensor (41), and A heat dissipation and holding plate (44) for the image sensor (41) is laminated. The substrate (42) is electrically connected to a control unit (not shown) of the digital camera (10) via a flexible substrate (43) and the like.

  The plate (44) is excellent in heat dissipation such as copper and copper alloy, and can be formed of a metal having a predetermined strength.The plate (44) has a screw hole (27 in the lens barrel (21). ) And a screw hole (45) is opened at a position opposite to. Further, the tilt adjusting member (35) of the packing (30) can come into contact with the plate (44).

  The plate (44) is attached to the lens barrel (21) so that the packing (30) is sandwiched therebetween, and is fastened with screws (47). At this time, the rib (33) of the packing (30) is in contact with the vicinity of the periphery, which is the non-light-receiving surface portion of the image sensor (41), and the tilt adjustment member (35) is in contact with the plate (44).

  In the lens device (20) having the above configuration, the tilt adjustment member (35) is sandwiched between the lens barrel (21) and the image sensor unit (40) and compressed by elastic deformation, and the image sensor unit (40) is Always energized in the direction away from the tube (21).

  In this state, by adjusting the screwing amount of the screw (47) (three in the figure) as appropriate, tilt adjustment is performed by tilting the light receiving surface of the image sensor (41) with respect to the optical axis of the lenses (22) and (23). Or by changing the distance between the light receiving surface of the image sensor (41) and the lens, the flange back can be adjusted.

  As described above, according to the lens device (20) of the present invention, without using a plurality of minute springs as in the prior art, the tilt adjustment member (35) integrally formed with the packing (30) is used for the imaging element (35). 41) can be energized, so that the assembly process of the lens device (20) accompanying the mounting of the imaging device (41) can be simplified, and the number of parts can be reduced.

  Further, by configuring the tilt adjusting member (35) from an elastic resin such as the same rubber as the packing (30), it is possible to improve the accuracy of the parts as compared with the spring. Specifically, the variation between the parts of the tilt adjusting member (35) can be suppressed to about 3 to 5% or less, and the imaging element can be stably held in the lens barrel (21).

In the above embodiment, the lens device (20) is a bending optical system, but the present invention is not limited to this.
In addition, the number and shape of the tilt adjusting members (35) formed integrally with the packing (30), and the number of screws (47) for attaching the image pickup device unit (40) are also limited to the above embodiment. Clearly not.

  INDUSTRIAL APPLICABILITY The present invention is useful as a lens device having an image sensor that requires tilt adjustment and an image pickup device including the lens device.

(10) Digital camera (imaging device)
(20) Lens device
(21) Lens barrel
(30) Packing
(35) tilt adjustment member
(40) Image sensor unit
(41) Image sensor

Claims (3)

A lens apparatus comprising: a lens barrel that accommodates a lens; and an imaging element that is attached to the lens barrel by screwing through a packing made of an elastic resin,
A lens device, wherein a tilt adjusting member for biasing the image sensor in a direction away from the lens barrel is integrally formed in the packing.   The lens apparatus according to claim 1, wherein the tilt adjusting member has a cylindrical shape.   An imaging device comprising the lens device according to claim 1.

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