JP2617765B2 - Camera actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a camera actuator used as a drive source of an automatic aperture mechanism provided in various cameras such as a camera for photographing, a television camera, and a video camera.

[Prior art]

As this type of camera actuator, those having the configuration disclosed in Japanese Patent Application Laid-Open No. 62-81962 and the configuration disclosed in Japanese Utility Model Application Publication No. Sho 62-19097 are well known. .

[Problems to be Solved by the Invention]

The former conventional technique has a configuration in which a flange portion for fixing the actuator inside the camera is integrally formed in a state of protruding from the upper edge of the housing or yoke. Since this yoke is generally formed by drawing, the above-mentioned flange portion protrudes, which makes manufacturing difficult, and the presence of the flange portion makes the magnetic force distribution non-uniform, so that the suction There are problems such as the occurrence of phenomena and torque unevenness, and variations in products. Further, in the latter conventional example, the yoke and the coil frame have no mounting means at all, and a separate mounting member is required when the yoke and the coil frame are incorporated into the camera, and therefore, the number of parts is increased. In addition to the parts and work problems that require time and labor for assembling, the coil frame is composed of vertically divided left and right frames, and when these left and right frames are assembled, a permanent magnet is housed inside. However, there is a problem in that the combination at the time of merging is not constant, an eccentricity of the rotating shaft occurs due to a combination error, and an error occurs synergistically with the mounting position of the yoke, resulting in a product having variations.

[Means for Solving the Problems]

As a specific means for solving the problem of the conventional example, the present invention comprises a cylindrical yoke and a bobbin in which a rotor is housed in an internal rotor chamber and a coil is wound outside, and the bobbin is symmetrically positioned. In addition, a body portion around which the coil is wound in the vertical direction and a protrusion for pressing against the yoke are provided, respectively, and are divided into an upper bobbin and a lower bobbin, which are used for positioning when combined with the divided surface. An uneven portion is provided, a bearing portion of the rotor is provided at a substantially central portion of the rotor chamber, a window hole communicating with the rotor chamber is provided on a side surface of one of the protrusions, and a ventilation portion is provided along an outer edge of the window hole. And a mounting portion that protrudes from the upper edge of the yoke is formed integrally with the other protruding portion, and the yoke itself has no mounting portion. Is easy and By bisecting the bobbin up and down not only the eccentricity of the rotor does not occur, it is easy task combination is further to the inside of the heat dissipation effect becomes large by the ventilation passage.

【Example】

Next, the present invention will be described in more detail based on the illustrated embodiment. Reference numeral 1 denotes a cylindrical yoke, and a bobbin which is press-fitted into the yoke is assembled into a lower bobbin 2 and an upper bobbin, which are roughly divided into upper and lower parts. The upper and lower bobbins are made of plastic. The lower bobbin 2 has a rotor or a permanent magnet 4
Is provided, a coil winding body 22 is provided at a symmetrical position on a peripheral surface of the rotor chamber, and a substantially crescent-shaped protruding section which is in pressure contact with the inner wall surface of the yoke 1 is provided.
23a and 23b are integrally formed at symmetrical positions. A plurality of terminals 24 to which the ends of the coil and the external power supply line are attached are mounted on the lower surfaces of these protruding portions, and these terminals are provided with slit portions 24a at their tips. Further, an upper surface of one of the protrusions 23a is provided with a concave portion 25 for alignment at the time of combination with the upper bobbin 3, and the other protrusion 23b is also provided with a concave portion 26 for position alignment. Window hole leading to the rotor chamber 21
27 is provided, and a ventilation path 28 is formed along the outer edge of the window hole 27. A bearing 29 for supporting the rotating shaft 5 of the rotor 4 is provided substantially at the center of the bottom of the rotor chamber 21. Like the lower bobbin 2, the upper bobbin 3 has a rotor chamber 31 in which the rotor 4 is housed substantially in the center thereof,
A coil winding body 32 is provided on the peripheral surface of the rotor chamber at a symmetrical position, and projections 33a and 33b having a substantially crescent cross section which are in pressure contact with the inner wall surface of the yoke 1 are integrally formed at the symmetrical position. . And, on the upper part of the protruding part 33a, a square mounting part 3
The lower bobbin 2 has a projection 35 formed on the lower surface so as to fit into the positioning recess 25 of the lower bobbin 2. In addition, on the lower surface of the other protruding portion 33b, a convex portion 36 that fits into the concave portion 26 for alignment is formed so as to protrude, respectively,
A window hole 37 communicating with the rotor chamber 31 is provided on the side surface,
An air passage 38 is formed along the outer edge of the window hole 37, and a bearing 39 is formed substantially in the center of the rotor chamber 31. When combining the upper and lower bobbins formed in this way,
The rotor 4 is housed therein, and both ends of the shaft 5 of the rotor are respectively supported by bearings 29 and 39 of each bobbin.
Are fitted into the concave portions 25 and 26 for alignment, respectively, and the lower bobbin 2
By combining the upper bobbin 3 and the upper bobbin 3, the shaft bobbin can be easily assembled without displacement and without requiring any skill of the operator. After the bobbins 2 and 3 are combined, the coils 6 and 7 are wound around the body portions 23 and 32 by a predetermined amount. At this time, the end of each coil is sandwiched between the slits 24a of the terminal 24, and when the coil is wound, the end is further sandwiched and held between the slits 24a of another terminal, thereby forming the coil. The winding operation can be easily performed. Also, in the winding of the coils 6 and 7, there is a sufficient space, so that a sufficient number of windings can be obtained, whereby high torque can be generated. After the coils 6 and 7 are wound around the bobbin, the external power supply lines 8 are connected to the terminals 24 by means such as soldering, and then the terminals 24 are bent inward, and the bobbins are pressed into the yoke 1. And attach it. If the yoke 1 used in this case is a bottomed cylinder, a predetermined hole 1a may be provided at the bottom of the cylinder to take out the outer power supply line 8. When the bobbin is press-fitted and stored in the yoke 1, the air passages 28 and 38 are opened upward with a predetermined gap between the yoke 1 and the rotor chambers 21 and 31 are substantially opened to the outside. In this state, the heat radiation effect is increased.
Further, the mounting portion 34 provided on the upper bobbin 3 is located protruding from the upper edge of the yoke 1, and can be easily incorporated into a camera or the like via the mounting portion.

【The invention's effect】

As described above, the camera actuator according to the present invention includes a cylindrical yoke and a bobbin in which a rotor is housed in an internal rotor chamber and a coil is wound outside, and the bobbin is symmetrical and has a vertical position. In addition to providing a body part around which the coil is wound in the direction and a projection part for pressing against the yoke, the body part is divided into an upper bobbin and a lower bobbin. A rotor bearing portion is provided at a substantially central portion of the rotor chamber, and a window hole communicating with the rotor chamber is provided on a side surface of one of the protruding portions,
A ventilation portion is provided along the outer edge of the window hole, and a mounting portion that protrudes from the upper edge of the yoke is formed integrally with the other protruding portion, so that no mounting portion is particularly provided on the yoke. By providing the mounting portion at the protruding portion of the upper bobbin, there is an excellent effect that the manufacture thereof is easy and there is no variation in a product having a uniform magnetic force characteristic. Further, by dividing the bobbin into upper and lower parts, an error in the combination hardly occurs, not only does not cause eccentricity of the rotor, but also has an excellent effect that the combination work is easy. Furthermore, by providing the window hole communicating with the rotor chamber and providing the ventilation path along the outer edge of the window hole, the temperature rise of the rotor chamber due to the heat generated by the coil can be positively radiated from the inside, An excellent effect that performance degradation due to overheating can be prevented is also achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a camera actuator according to the present invention, which is shown separately, FIG. 2 is a longitudinal sectional view of the actuator, and FIG. 3 is a plan view of the actuator. DESCRIPTION OF SYMBOLS 1 ... Yoke, 2 ... Lower bobbin 3 ... Upper bobbin, 4 ... Rotor 5 ... Rotor shaft, 6, 7 ... Coil 8 ... External power supply lines 21, 31 ... Rotor chamber, 22, 32 ... Body 23a, 23b, 33a, 33b ... Projection 24 ... Terminal, 25, 26 ... Recess 27, 37 ... Window hole, 28, 38 ... Ventilation passage 29, 39 ... Bearing part, 34 ...... Mounting part

Claims (2)

(57) [Claims] 1. A cylindrical yoke, and a bobbin in which a rotor is housed in an internal rotor chamber and a coil is wound outside, wherein the bobbin has a symmetrical position and a body portion around which the coil is wound in a vertical direction. Protrusions for press contact with the yoke are provided, respectively, and the upper bobbin and the lower bobbin are divided into two parts, and the divided surface is provided with a concave-convex part for positioning when combined, and substantially at the center of the rotor chamber. The bearing portion of the rotor is provided in the portion, a window hole communicating with the rotor chamber is provided on the side surface of one of the protrusions, a ventilation portion is provided along the outer edge of the window hole, and the other protrusion is provided on the other protrusion. An actuator for a camera, wherein a mounting portion protruding from an upper edge of the yoke is integrally formed. 2. The camera actuator according to claim 1, further comprising a plurality of terminals to which ends of lower coils of the lower bobbin are fixed.