JP2007121616A - Optical equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide optical equipment where vibration and noise made from a motor unit is restrained to be low. <P>SOLUTION: By making the area of a supporting region S1 where a supporting member 11 supports a motor 10 equal to or under 1/2 of the area of the end face 10b of the motor, the motor is supported by the supporting member 11 through the end face of the motor orthogonal to the output shaft of the motor. By such constitution, the natural frequency of the motor unit is changed, and resonance with the rotational frequency of the motor 10 is prevented from occurring. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical apparatus such as a camera.

  Due to the nature of cameras and videos, it is necessary to drive lenses and feed films and tapes in order to take pictures. In order to achieve this mechanism, a motor is used as its drive source. The rotational force is obtained as an appropriate rotational force by the lens driving unit at the final end through the transmission system. In order to achieve this, a gear train (deceleration mechanism) is formed between the motor and the lens drive unit, and a drive board is also required to support it. Normally, when a lens or the like is driven, all parts of the drive mechanism shown above, specifically, the noise on the drive board due to vibrations of the gear sliding part of the drive board, the motor, and each structure, etc. (Sliding noise) occurs. In particular, drive sound and vibration generated from a motor unit including a motor and a support member that supports the motor are very large because the motor unit itself is the source of generation, and the influence on other parts is also great.

When using the camera and video in a quiet place, these sounds can be heard very loudly even with a little start-up sound, and there is a problem that not only the photographer but also the surrounding people are greatly affected. .
In addition, there is a problem that these sounds are also recorded in the recording data at the time of video shooting of the video camera and the digital camera.

As a technique for reducing drive noise and vibration generated from the motor unit itself, Patent Document 1 discloses an example in which a cutout portion is provided around a portion where a motor is attached to reduce vibration generated from the motor.
However, in the method described in Patent Document 1, the support member that supports the motor needs to be formed of a flexible synthetic resin member. For example, there is a problem that metal cannot be used for the support member.

JP-A-8-122872

  An object of the present invention is to provide an optical apparatus that generates less vibration and noise from a motor unit.

In order to solve the above-mentioned problems, an invention according to claim 1 is an optical device comprising a motor having an output shaft and a support member that supports the motor via a motor end surface intersecting the output shaft of the motor. The optical device is an optical device characterized in that an area of a support region where the support member supports the motor is less than or equal to an area of an end surface of the motor.
A second aspect of the present invention is the optical instrument according to the first aspect, wherein the center of gravity of the support region coincides with the center position of the output shaft.
According to a third aspect of the present invention, in the optical apparatus according to the first or second aspect, at least one of the motor end surface and the support member protrudes from a portion corresponding to the support region. It is an optical instrument.
According to a fourth aspect of the present invention, in the optical apparatus according to any one of the first to third aspects, a contact surface shape corresponding to the support region is provided between the motor end surface and the support member. An optical apparatus is characterized in that a spacer is provided.
A fifth aspect of the present invention is the optical instrument according to the fourth aspect, wherein the spacer is formed of an elastic body having a vibration absorbing function.
According to a sixth aspect of the present invention, in the optical device according to any one of the first to fifth aspects, the motor is fixed to the support member using screws, and the output shaft direction is When viewed from above, the screw is an optical apparatus characterized in that the screw is in a position overlapping the support region.

The following effects can be achieved.
According to the first aspect of the present invention, the area of the support region where the support member supports the motor is less than or equal to ½ of the area of the motor end surface, so that vibration and noise can be suppressed.
According to the second aspect of the present invention, since the center of gravity of the support region coincides with the center of the output shaft, the motor can be fixed stably.
According to the invention of claim 3, since at least one of the motor end surface and the support member protrudes from the portion corresponding to the support region, the natural frequency can be changed with a simple configuration.
According to the invention of claim 4, since the spacer having the contact surface shape corresponding to the support region is arranged between the motor end surface and the support member, the natural frequency can be reduced only by adding the spacer. Can be changed.
According to the invention of claim 5, since the spacer is formed of an elastic body having a vibration absorbing function, vibration transmitted from the motor can be reduced.
According to the sixth aspect of the present invention, the motor is fixed to the support member using the screw, and when viewed from the output shaft direction, the screw is in a position overlapping the support region. Therefore, the natural frequency can be reliably changed without being equivalent to the fact that most of the region of the motor end face is fixed.

  The object of the present invention is to reduce the vibration and noise generated from the motor unit by changing the contact area between the motor and the support member.

FIG. 1 is a diagram illustrating a motor unit used in the optical apparatus according to the first embodiment. 1A is a perspective view, FIG. 1B is a side view, and FIG. 1C is a front view as viewed from the output shaft side.
The optical device in the present embodiment is a digital camera capable of shooting a moving image, and a motor unit described below is a portion that generates a driving force for driving the lens barrel.
The motor 10 outputs a rotational driving force from the output shaft 10a, transmits the driving force to a driving force transmission mechanism (not shown), and uses it as a driving force for the lens barrel.
The support member 11 is a member that is formed of stainless steel and supports the motor 10. The support member 11 is formed with a motor mounting portion 11a to which the motor 10 is mounted protruding one step. The motor mounting portion 11a is in a range approximately half of the surface of the support member 11 that faces the motor 10.
The screw 12 is a screw that fixes the motor 10 to the support member 11, and is screwed into the screw hole of the motor 10 through two through holes formed in the motor attachment portion 11a.

Only the motor attachment portion 11 a of the support member 11 contacts the motor end surface 10 b of the motor 10. Therefore, in FIG. 1C, the hatched area is a support area S <b> 1 where the support member 11 supports the motor 10.
Conventionally, a support member is generally disposed so as to be in close contact with the entire surface of the motor end surface 10b (hereinafter, an example in which the support member is in close contact with the entire surface of the motor end surface 10b is referred to as a conventional example).

However, in the present embodiment, the area of the support region S1 is approximately ½ of the area of the motor end surface 10b. As a result, when the motor 10 and the support member 11 of this embodiment are viewed as one motor unit, there is an action equivalent to that of the conventional example in which the overall rigidity is lowered. Therefore, resonance with the rotational frequency of the motor can be prevented, and vibration and noise can be suppressed.
The center of gravity of the support region S1 is shifted from the rotation center position of the motor 10 (position of the output shaft 10a). Thereby, there exists an effect | action that the balance between the motor 10 and the supporting member 11 changes.
By these two actions, the natural frequency of the motor unit (the motor 10 and the support member 11) of this embodiment changes.
The rotational frequency of the motor 10 has a very high value. However, if the motor unit has a natural frequency close to an integral multiple of the rotational frequency, these motors resonate, and vibration and noise of the motor unit. May increase significantly.
In the present example, the noise was reduced by 5 dB compared to the conventional example by moving the natural frequency.

In the following description, the same reference numerals are given to portions that perform the same functions as those in the first embodiment described above, and overlapping descriptions are omitted as appropriate.
FIG. 2 is a diagram collectively showing an example of a specific form of the support region where the motor and the support member are in contact with each other.
FIG. 2B is a diagram illustrating the support region S2 of the second embodiment. In addition, Example 1 was written together in Fig.2 (a).
Example 2 is an example in which the position and area of the support region S1 of Example 1 are changed.
In the support member 21 according to the second embodiment, the range of the motor attachment portion 21a is approximately ¼ of the surface of the support member 21 that faces the motor 10.
The support region S2 has an area substantially ¼ of the area of the motor end surface 10b.
In the present example, the noise was reduced by 7 dB compared to the conventional example by moving the natural frequency.

FIG. 2C is a diagram illustrating the support region S3 of the third embodiment.
Example 3 is an example in which the position and area of the support region S1 of Example 1 are changed.
In the support member 31 of the third embodiment, the range of the motor attachment portion 31a is approximately 範 囲 of the surface of the support member 31 facing the motor 10.
And support area | region S3 becomes an area of about 1/3 of the area of the motor end surface 10b.
In the present example, the noise was reduced by 5 dB compared to the conventional example by moving the natural frequency. Thus, the natural frequency can be adjusted by appropriately setting the support region.
The area of the support region S3 in the third embodiment is the same as that of the support region S1 in the first embodiment, but the center of gravity position of the support region S3 matches the rotation center position of the motor 10. Therefore, the motor 10 is supported more reliably than in the first embodiment, and the driving of the motor 10 is stabilized.

(Other examples of support area)
The shape and area of the support region are not limited to those described in the above-described first to third embodiments, and may be, for example, as shown in FIGS. 2 (d) to 2 (f). In any form, the areas of the support regions S1 to S6 are less than or equal to ½ of the area of the motor end surface 10b.
In the configurations as shown in FIGS. 2D and 2E, since the areas of the support regions S4 and S5 can be made smaller than those in the first to third embodiments, the natural frequency can be moved more greatly. 2 (f), the area of the support region S6 is equal to the support region S1 of FIG. 2 (a), but the center of gravity position is substantially coincident with the rotation center position of the motor 10. The motor 10 can be stably held.

(Other examples of support area)
In the embodiment described above, the support region (S1, S2, S3) is provided by the motor mounting portion (11a, 21a, 31a, 41a, 51a, 61a) protruding from the support member (11, 21, 31, 41, 51, 61). , S4, S5, S6), the shape and area are determined. However, the operation and effect of the present invention can be obtained even if the motor and the support member are connected in other forms.
FIG. 3 is a list of methods for connecting the motor and the support member. FIG. 3A shows the form of the embodiment described above.
The example shown in FIG. 3B is an example in which a part of the motor end surface itself of the motor 70 is protruded without protruding the support member 71 side. In this case, the support member 71 can be formed by pressing a metal material.
The example shown in FIG. 3C is an example in which neither the support member 71 side nor the motor 10 side is projected, and a spacer 80 having a contact surface shape corresponding to the support region is disposed between them. In this case, if the spacer 80 is formed of an elastic body such as rubber, synthetic resin, or gel material having a vibration absorbing function, a higher vibration suppressing effect can be obtained.
The example shown in FIG. 3D is an example in which neither the support member 71 side nor the motor 10 side is projected, and an adhesive 90 is applied and bonded in a contact surface shape corresponding to the support region between them. is there.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
For example, in each embodiment, the example in which the motor and the support member are fixed using two screws 12 is shown. However, the present invention is not limited to this. For example, the number of screws may be one or three. You may use above.

  In each embodiment, a digital camera capable of shooting moving images has been described as an example. However, the present invention is not limited to this, and for example, a camera that does not have a moving image shooting function may be used. It may be a so-called video camera.

FIG. 3 is a diagram illustrating a motor unit used in the optical apparatus according to the first embodiment. It is the figure which showed collectively the example of the specific form of the support area | region where a motor and a support member contact. It is the figure which enumerated the connection method of a motor and a supporting member.

Explanation of symbols

10, 70: Motor, 10a: Output shaft, 10b: Motor end surface, 11, 21, 31, 41, 51, 61, 71: Support member, 11a, 21a, 31a, 41a, 51a, 61a: Motor mounting portion, 12 : Screw, 80: Spacer, 90: Adhesive, S1 to S6: Support region

Claims (6)

A motor having an output shaft;
A support member that supports the motor via a motor end surface that intersects the output shaft of the motor;
An optical instrument comprising:
The area of the support region where the support member supports the motor is an area that is 1/2 or less of the area of the motor end surface;
Optical equipment characterized by. The optical instrument according to claim 1,
The center of gravity of the support region is coincident with the center of the output shaft;
Optical equipment characterized by. The optical apparatus according to claim 1 or 2,
At least one of the motor end surface and the support member protrudes from a portion corresponding to the support region,
Optical equipment characterized by. In the optical instrument according to any one of claims 1 to 3,
A spacer having a contact surface shape corresponding to the support region is disposed between the motor end surface and the support member;
Optical equipment characterized by. The optical apparatus according to claim 4, wherein
The spacer is formed of an elastic body having a vibration absorbing function;
Optical equipment characterized by. In the optical instrument according to any one of claims 1 to 5,
The motor is fixed to the support member using screws,
When viewed from the output shaft direction, the screw is in a position overlapping the support region;
Optical equipment characterized by.

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