JP5072785B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus having an encoder function for detecting a rotation angle in an imaging apparatus that drives a camera unit at least in a tilt direction.

Conventionally, a motor and a drive transmission mechanism are arranged on a tilt shaft of an imaging apparatus, and a cable is arranged in a spiral shape on the opposite side (see Patent Document 1).
JP 2001-285675 A

  However, recent imaging apparatuses are equipped with an encoder function that accurately detects the rotation angle in order to increase the stop position angle with higher magnification and to present stop position angle information to the user. Needs are coming out.

  When an encoder function is mounted on a conventional imaging device, if the encoder is disposed on the same side as the tilt drive unit, the encoder plate may be soiled by grease applied to the tilt gear.

  Further, when the restriction of the encoder unit is insufficient with respect to the thrust direction of the rotation shaft of the tilt driving unit, the positional relationship between the encoder plate and the encoder sensor may not be appropriate. In addition, the encoder plate and the encoder sensor may come into contact with each other and damage the encoder plate, or the sliding resistance may increase, resulting in an operation failure with respect to tilt rotation, deterioration in stop position accuracy, or abnormal noise during sliding. Therefore, although it is necessary to position an encoder part with high precision, in this case, a complicated structure is required.

  The present invention aims to solve these problems.

  To achieve the above-described object, a camera unit, drive means for driving the camera unit in the tilt direction, and encoder means for detecting the rotational position of the tilt angle on the opposite side of the drive means with respect to the tilt axis The position of the encoder plate of the encoder means is restricted with respect to the thrust direction of the tilt axis, and the tilt driving means arranged on the opposite side is configured to be movable with respect to the tilt axis direction. An imaging device is provided.

  According to the present invention, the encoder plate position of the encoder unit is regulated to an appropriate position with respect to the thrust direction of the tilt shaft, and the tilt drive unit arranged on the opposite side is not regulated with respect to the tilt axis direction. Therefore, the positional relationship between the encoder plate and the encoder sensor can be made appropriate. In addition, the encoder plate and encoder sensor come into contact with each other and damage the encoder plate, and the sliding resistance increases, causing problems such as malfunction due to tilt rotation, deterioration of stop position accuracy, and noise caused by sliding. It was.

  The encoder unit also serves as a storage unit configured such that a flat cable that electrically connects the camera unit and the imaging apparatus main body is spirally arranged on the tilt axis. Therefore, even if an encoder function is installed, a space-saving and compact imaging device can be realized.

  The imaging apparatus according to the first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is an external perspective view of an imaging apparatus according to the first embodiment of the present invention.

  The imaging device 10 includes a main body 30, a pan unit 40, a camera unit 20, and a tilt unit 50. The camera unit 20 is configured to be rotatable about the tilt axis A in the directions of arrows A1 and A2, and the pan unit 40 is configured to be rotatable about the pan axis B in the directions of arrows B1 and B2.

  FIG. 2 is a main cross-sectional view of the imaging apparatus according to the first embodiment of the present invention.

  A tilt axis R55 and a tilt axis L56 are attached to the camera unit 20, and the tilt bearing portion R40a and the tilt axis R55 of the pan unit 40 are configured so that the tilt bearing portion L40b and the tilt axis L56 are rotatably fitted. Yes. The tilt gear 54 is fixed to a tilt shaft R55 by a screw, and the drive of the tilt motor 51 is transmitted to the tilt worm gear 53 and is transmitted to the tilt gear 54 by gear connection, so that the camera unit 20 is tilted.

  An encoder plate holder 61 to which an encoder plate 60 is attached is coaxially attached to the tilt shaft L56. An encoder sensor 62 that detects the rotational position of the tilt angle is disposed in the slit portion of the encoder plate 60. A tilt spiral portion 70 a of the flat cable 70 is formed inside the encoder plate holder 61.

  Here, since the bearing portion 40b of the pan unit is sandwiched by the restriction portion 56a of the tilt axis L56 and the restriction portion 61a of the encoder plate holder 61, the camera unit 20 is in the S direction (thrust direction of the tilt shaft). It is regulated not to move to.

  In addition, since the tilt shaft L56, the encoder plate holder 61, and the encoder plate 60, which are integrally attached to the camera unit 20, are also positioned with high accuracy in the S direction, the positions of the encoder plate 60 and the encoder sensor 62 in the S direction. Can be accurately obtained.

  At this time, the tilt axis R54 is not restricted in the S direction with respect to the bearing portion 40a of the pan unit, and is movable in the S direction.

  FIG. 3 is a perspective view of the encoder unit of the imaging apparatus according to the first embodiment of the present invention. The central portion of the tilt rotation shaft of the encoder plate holder 61 to which the encoder plate 60 is mounted is urged in the C direction by the tilt thrust plate spring 63, so that the restricting portion 61a of the encoder plate holder 61 in the pan unit bearing portion 40b in FIG. Are in contact with each other. For this reason, it is possible to absorb the looseness of fitting, and it is possible to position with higher accuracy.

  FIG. 4 is a side view of the encoder wheel and the encoder sensor according to the first embodiment of the present invention. The encoder plate 60 and the encoder sensor 62 have a gap 62a in the S direction, but the gap 62a is as small as 0.3 mm or less in order to achieve high resolution of the encoder sensor.

  In order to arrange the encoder plate 60 in such a small gap, it is necessary to position the encoder plate 60 with high accuracy in the S direction as described above.

  If the encoder plate 60 varies in the S direction, the encoder plate and the encoder sensor may come into contact with each other and damage the encoder plate, resulting in an encoder reading failure. Further, the contact may increase sliding resistance, which may cause malfunctions such as an operation failure with respect to tilt rotation, deterioration of stop position accuracy, or abnormal noise during sliding.

  The structure of the encoder unit of the imaging apparatus according to the second embodiment will be described.

  FIG. 5 is a perspective view of the wiring portion of the flat cable of the tilt portion according to the second embodiment of the present invention.

  As shown in FIG. 5, a tilt spiral portion 70 a of the flat cable 70 guided by the cable holder portion 40 c of the pan unit 40 is formed in the tilt encoder portion. The spiral portion 70a is a cable for giving the extra length of the flat cable 70 when tilted.

  After the spiral portion 70a of the flat cable is stored in a predetermined state, the flat plate 70 is pulled out in the direction opposite to C by fitting the encoder plate holder 61, on which the encoder plate 60 is mounted, with the tilt axis L56 in the C direction. Can be prevented.

  By adopting such a configuration, it is possible to realize a space-saving and compact imaging device even if an encoder function is installed.

1 is an external perspective view of an imaging apparatus according to a first embodiment of the present invention. 1 is a main cross-sectional view of an imaging apparatus according to a first embodiment of the present invention. It is a perspective view of the encoder part of the imaging device of the 1st Embodiment of this invention. It is a side view of the encoder board and encoder sensor of the 1st Embodiment of this invention. It is a perspective view of the wiring part of the flat cable of the tilt part of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Imaging device 20 Camera unit 30 Main body 40 Pan unit 40a Tilt bearing part (R side) of pan unit
40b Pan unit tilt bearing (L side)
40c Flat cable holder part of pan unit 50 Tilt part 51 Tilt motor 53 Tilt worm gear 54 Tilt gear 55 Tilt axis R
56 Tilt axis L
56a Restriction part a of the tilt axis L of the first embodiment of the present invention
56b Restriction part b of tilt axis L of the first embodiment of the present invention
60 Encoder plate 61 Encoder plate holder 61a Encoder plate holder restricting portion 62 Encoder sensor 62a Encoder sensor clearance 63 Tilt thrust leaf spring 70 Flat cable 70a Flat cable tilt spiral portion

Claims (2)

A camera unit;
Drive means for driving the camera unit in the tilt direction;
Encoder means for detecting the rotational position of the tilt angle on the opposite side of the drive means with respect to the tilt axis;
An image pickup apparatus characterized in that the position of the encoder plate of the encoder means is restricted with respect to the thrust direction of the tilt axis, and the tilt driving means arranged on the opposite side is movable with respect to the tilt axis direction.   2. The encoder unit according to claim 1, wherein the encoder unit also serves as a storage unit configured such that a flat cable electrically connecting the camera unit and the imaging apparatus main body is spirally arranged on the tilt axis. Imaging device.

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