JPH0453190Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a voice coil type linear motor.

[Conventional technology]

A voice coil type linear motor used for radially reciprocating a disk of a carriage on which a pickup is mounted in an information reading and reproducing apparatus generally has the configuration shown in FIG.

That is, a carriage 1 carrying an optical pickup (not shown) is provided above a base (not shown) so as to be movable back and forth via rollers (not shown), and a movable coil 2 is wound around the carriage 1. The bobbin 3 is attached, and the center pole 4 having a non-magnetic good conductor 4a in the bobbin 3 is placed between the inside of the insertion part of the bobbin 3 and the outside of the non-magnetic good conductor 4a of the center pole.
Yokes 5 and 6 are provided on both left and right sides of the center pole 4 in opposition to each other along the direction of movement of the bobbin 3.

Moreover, a permanent magnet 7 is installed inside both yokes 5 and 6.
8 is attached.

Furthermore, as shown in FIGS. 5a and 5b, the bobbin 3 is provided with mounting screws 11 for attaching it to the carriage 1 on both front and rear sides 9 and 10 of the cylindrical body that includes the insertion portion (not shown) for the center pole 4. It is constructed by providing a mounting portion 12 and wrapping a moving coil 2 around a central portion 13.

[Problem that the invention attempts to solve]

According to the voice coil type linear motor having the above-described configuration, the distance between the outside of the non-magnetic good conductor 4a wound around the center pole 4 and the inside of the bobbin 3 is narrow, resulting in the following problem.

Since the carriage 1 is regulated by the guide part and the center pole 4 is regulated by the outside of the yokes 5 and 6, when adjusting the distance between the center pole 4 and the inside of the bobbin 3, positioning by machining is required. In addition, since the carriage 1 is moved in the left-right direction to confirm whether or not there is contact, the assembly process takes time.

The present invention was created in view of these drawbacks.
A voice coil type that can be easily adjusted between a movable member consisting of at least a movable coil and an opposing member, such as the center pole, which constitutes at least a part of the magnetic circuit and which is disposed in between. The purpose is to provide linear motors.

[Means to solve the problem]

The voice coil type linear motor of the present invention has a movable body including a movable member made of at least a coil, and a movable body that moves the movable body back and forth in a straight line in order to optically read information on a recording medium in which information is recorded in a track shape. a guide rod fixed to the base to allow the magnetic circuit to move, and an opposing member fixed to the base via the movable member and extending in the length direction of the guide rod and forming at least a part of the magnetic circuit. A voice coil type linear motor in an information reading device comprising: a window provided in at least a part of the movable body, and configured such that the relative positional relationship between the facing member and the movable member can be observed through the window; This is a voice coil type linear motor featuring the following.

[Effect]

By providing a window in at least a portion of the movable body, the relative positional relationship between the movable member and the opposing member can be observed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway plan view of the voice coil type linear motor, FIG. 2 is a side view of the same, FIG. 3a is a side view of a bobbin, and FIG. 3b is a plan view of the same.

In the figure, reference numeral 30 denotes a carriage on which an optical pickup 31 is mounted, which is movably placed on a base 33 via rollers 32 attached to the bottom.

35 is a bobbin attached to the inside of the carriage 30, and a movable coil 38 is wound between the front and rear ends 36, 37 of this bobbin 35, and the front and rear both sides 3
Window 3 on the upper and lower and left and right side walls of 6 and 37
9, 40, 41, and 42 are provided.

Also, the front and rear sides 36, 37 of this bobbin 35
is a diagonal part 43, which slopes from the upper side to the lower side.
44, and mounting screws 45 for attaching to the carriage 30 are provided at the bottom of both the front and rear sides.

A center pole 50 is fitted into the bobbin 35 and covered with a non-magnetic good conductor 51, and is installed above the base 33.

52, 53 These are yokes disposed opposite to each other on both the left and right sides of the center pole 50, and permanent magnets 54, 55 are attached inside both yokes 52, 53.

Then, the center pole 50 is connected to the movable coil 3.
When inserting into the wound bobbin 35 of No. 8, there is a space between the outside of the non-magnetic good conductor 51 of the center pole 50 and the inside of the bobbin 35, and the window 39, 40, 41,
A gauge (not shown) can be inserted and adjusted through 42 to form an even gap.

[Effect of idea]

According to the voice coil type linear motor of the present invention, the following effects can be obtained.

A voice coil type linear motor is assembled by providing a window in at least a part of the movable body so that the relative positional relationship between the movable member consisting of at least a coil and the opposing member constituting at least a part of the magnetic circuit can be observed. Work can be performed with high precision and high efficiency.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view showing an embodiment of the voice coil type linear motor of the present invention, Fig. 2 is a side view of the same, Fig. 3a is a side view of the bobbin, and Fig. 3b is the same. 4 is a plan view of a conventional voice coil linear motor; FIG. 5 a is a side view of the bobbin of a conventional voice coil linear motor; FIG. 5 b
is the same plan view. 30... Carriage, 31... Optical pickup, 32... Roller, 33... Base, 35... Bobbin, 36, 37... Front and rear both sides, 38... Moving coil, 39, 40, 41, 42... ...wind,
50...Center pole, 51...Nonmagnetic good conductor,
52, 53...York.

Claims (1)

[Claims for Utility Model Registration] In order to optically read information on a recording medium in which information is recorded in a track shape, a movable body including a movable member consisting of at least a coil, and a method for reciprocating the movable body in a straight line. a guide rod fixed to a base; and an opposing member fixed to the base via a space between the movable member and the opposing member extending in the length direction of the guide rod and forming at least a part of a magnetic circuit. A voice coil type linear motor in an information reading device comprising: A window is provided in at least a part of the movable body, and the relative positional relationship between the facing member and the movable member can be observed through the window. Voice coil type linear motor.