JPH0629782Y2 - Optical pickup tilt mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a tilt mechanism of an optical pickup for recording information on a disc of a disc player or reading the recorded information.

(Prior Art) A perspective view of a conventional pickup mechanism is shown in FIG. 5, and its main parts are shown in a side view of FIG. 6 and a vertical sectional view of FIG. 7, respectively.

Left and right fulcrum shafts 4 and 4 are provided on the tilt chassis 3 on which the optical pickup 1 and the pickup feed mechanism 2 are mounted, and the fulcrum shaft 4 is fitted in the shaft support groove 7 of the tilt holder 6 provided on the chassis 5. The forked portion 8a of the engaging member 8 provided on one side of the tilt chassis 5 is engaged with the holder 9, and the tilt screw 11 is attached to the female screw 10 of the holder 9 (supported to the bracket 12 attached to the chassis 5). The male screw 13 is screwed in, and the tilt shaft 11 is rotated by the worm wheel 16 meshed with the worm 15 driven by the motor 14.
As a result, the tilt chassis 3 is tilted about the fulcrum shaft 4 as a fulcrum, and the light of the tilt sensor 18 is incident on the lower surface of the disc (not shown) mounted on the turntable 17 so that the optical pickup is attached to the lower surface. The tilting of the tilt chassis 3 is controlled so that the optical axis 1 is always vertical.

FIGS. 5, 6, and 7 show a playing state, in which the female screw 10 is screwed onto the male screw 13, and in the standby state before the disc is placed on the turntable 17, the eighth stage is shown. As shown in the figure, the female screw 10 is at a lower position apart from the male screw 13 (the female screw 10 is in contact with the lower end of the male screw 13 by a spring 19), and the tilt chassis 3 and the optical pickup 1 are also at the lowest position. Has become.

Then, when the disc is completely transferred to the turntable 17, the motor 14 is rotated by the action of the tilt sensor 18, and the female screw 10 starts to be screwed onto the male screw 13 of the tilt shaft 11.
The holder 8 and the tilt chassis 3 are raised and the optical axis of the optical pickup 1 is perpendicular to the lower surface of the turntable to start playing.

(Problems to be Solved by the Invention) In the above conventional mechanism, since the holder 9 is plate-shaped, the engagement point P between the forked portion 8a and the holder 9 is
The positions are displaced as shown in FIG.

As a result, in the standby state of FIG. 8, the female screw 10 of the holder 9 removed from the male screw 13 is inclined with respect to the screw center of the male screw 13, and even if the spindle shaft 11 starts to rotate.
It may not be screwed, and it may be difficult to return to the playing state.

Further, while the forked portion 8a of the engaging member 8 is engaged with the plate-shaped holder 9 assembled to the bracket 12, the tilt chassis 3
The assembling work for fitting the fulcrum shafts 4 and 4 into the shaft supporting grooves 7 and 7 of the tilt holder 6 is troublesome.

The present invention has been proposed in order to solve the problems of the conventional mechanism, and an object thereof is to provide a tilt mechanism devised so that the tilt shaft can be securely screwed into the holder from the standby state.

(Means for Solving the Problem) A tilt mechanism of an optical pickup according to the present invention is configured such that a tilt chassis on which an optical pickup and a pickup feed mechanism are mounted is pivotally supported on a chassis by left and right fulcrum shafts. An optical pickup configured to control an inclination of the tilt chassis by engaging an engaging member provided on the tilt chassis with an engaging portion of a holder and rotationally driving a tilt shaft screwed with the holder. In the tilt mechanism, the engaging portion is formed such that the engaging member, the engaging portion, and the engaging point portion include the tilt shaft and are located near a plane in the protruding direction of the engaging portion of the holder. It was done.

Then, a female screw portion is formed on the holder, a male screw portion is formed on the tilt shaft, and an upper portion of the female screw portion is formed into a sleeve having a size capable of being substantially closely fitted to an outer diameter portion of the male screw portion. ing.

(Operation) The engaging portion is formed such that the engaging member, the engaging portion, and the engaging point portion include the axis of the tilt shaft and are located in the vicinity of a plane in the protruding direction of the engaging portion of the holder. Therefore, the shaft center of the holder is always maintained in a posture substantially coincident with the shaft center of the tilt shaft even at a position out of the screw engagement with the tilt shaft.

As a result, when the tilt shaft starts to rotate, the holder can be securely screwed into the tilt shaft, and the holder and the tilt chassis can be returned to the playing state without mistake.

The holder has a female thread, the tilt shaft has a male thread, and the upper part of the female thread is formed into a sleeve of a size that allows it to fit tightly on the outer diameter of the male thread. When disengaged, the sleeve of the female thread portion is tightly fitted to the male thread portion, so that the axial center of the female thread portion is always aligned with the axial center of the male thread portion.

Therefore, when the tilt shaft starts to rotate, the female screw portion is screwed into the male screw portion without a mistake, and the tilting operation is performed in a predetermined manner.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of the optical pickup mechanism, FIG. 2 is an exploded perspective view of the tilt mechanism, FIG. 3 is a vertical sectional side view of an essential part of FIG. 1, and FIG. 4 is a side view of an essential part of FIG. The figures are shown respectively.

In each of the drawings, members having the same functions as those of the conventional mechanism are designated by the same reference numerals, and the description of the configuration is omitted.

The holder 22 provided with the female screw 21 to be screwed into the male screw 13 of the tilt shaft 11 is provided with a sleeve 23 on the upper portion of the female screw 21 and having a size capable of being fitted in close contact with the outer diameter portion of the male screw 13. In the right and left outer side portions of the holder 22, pin-shaped engaging portions 24, 24 having a substantially oval shape in a front view are formed, and an engaging point portion Q (engaging point or engaging surface) of the engaging portion 24 and the engaging member 8 is formed. Of any of the above), the shape of the engaging portion 24 is set so as to be positioned near the plane including the axis C of the tilt shaft 11.

Therefore, in the playing state in which the internal thread 21 is screwed onto the external thread 13, even when the tilt chassis 3 tilts and is not perpendicular to the axis C of the tilt shaft 11, the engagement point portion Q is not as shown in FIG. Since the lift shaft 11 is positioned near the plane including the axis C, the bending at the engagement point portion Q during the vertical movement of the lift shaft 11 is reduced.

Further, in the standby state in which the internal thread 21 is detached from the external thread 13 and is positioned below, the external thread 13 is attached to the holder 2 as shown in FIG.
The shaft center of the female screw 21 coincides with the shaft center C of the male screw 13 and the tilt shaft 11 by closely fitting the two sleeves 23.

Then, as a result of the above, when in the standby state, the tilt shaft 1
When 1 starts rotating, the female screw 21 can be immediately screwed into the male screw 13, and the holder 22, the tilt chassis 3, and the optical pickup 1 can be surely returned to the playing state.

Further, since the engaging portion 24 is not a plate shape like the holder 9 of the conventional mechanism but a pin shape, the engaging portion 24 of the holder 22 assembled in the bracket 12 together with the tilt shaft 11 is connected to the engaging member 24 of the engaging member 8. Further, the assembling work for fitting the left and right fulcrum shafts 4 of the tilt chassis 3 into the shaft supporting grooves 7 of the tilt holder 6 while engaging the portion 8a has become easy.

The shapes of the engaging member 8 and the engaging portion 24 are not limited to the above illustrated example.

The bracket 12 of the illustrated example has a shaft support hole 12b into which the upper shaft support portion 11a of the tilt shaft 11 can be laterally fitted, a large hole 12c into which the worm 15 is inserted from the side, and a motor 14 attached by a screw hole 12d. A small hole 12e for positioning the shaft neck portion 15a of the worm 15 is provided.

The optical pickup 1 of the illustrated example is slidably fitted to a guide rod 26 bridged to the tilt chassis 3, and the pickup feed mechanism 2 engages a rack 27 attached to the pickup 1 with a pinion (not shown). as well as,
The structure is driven by the worm wheel 28, the worm 29, and the motor 30.

(Effect of the Invention) Since the tilt mechanism of the optical pickup according to the present invention is configured as described above, the following effects are obtained.

(1) The engaging point between the engaging member of the tilt chassis and the engaging portion incorporated in the tilt shaft should be located near the plane in the protruding direction of the engaging portion of the holder, including the axis of the tilt shaft. Since the engaging portion is formed on the holder, the holder is always kept in a posture substantially aligned with the axis of the tilt shaft even at a position out of the screw engagement with the tilt shaft.

As a result, when the tilt shaft starts rotating, the holder can be securely screwed into the tilt shaft, and the holder and the tilt chassis can be returned to the playing state without mistake.

(2) The engaging portion is not a plate like the holder of the conventional mechanism, but has a structure that engages with the engaging member of the tilt chassis at the engaging point, so that the tilt chassis is pivotally supported on the chassis and the engaging member The assembling work to engage the holder with the holder became easy.

(3) The holder has an internal thread, the tilt shaft has an external thread, and the upper part of the internal thread is formed into a sleeve of a size that can be closely fitted to the outer diameter of the external thread. When disengaged from the male thread, the sleeve of the female thread is closely fitted to the male thread, so that the axial center of the female thread always matches the axial center of the male thread. Became.

Therefore, when the tilt shaft started to rotate, the female screw portion was screwed onto the male screw portion without any mistake, and the tilting operation was performed in a predetermined manner to provide an excellent tilt mechanism.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention.
FIG. 2 is an overall perspective view, FIG. 2 is an exploded perspective view of the tilt mechanism,
FIG. 3 is a side view of a longitudinal section of a main part in a standby state, FIG. 4 is a side view of the main part of FIG. 1, FIG. 5 is a perspective view of a conventional mechanism, and FIGS. 6 and 7 are main parts of FIG. FIG. 8 is a vertical sectional side view of a main part in a standby state. 1 ... Optical pickup, 2 ... Pickup feed mechanism,
3 ... Tilt chassis, 4 ... fulcrum shaft, 5 ... Chassis, 6 ... Tilt holder, 7 ... Shaft support groove, 8 ... Engaging member, 8a ... Two-forked part, 11 ... Tilt shaft, 11a ... Upper shaft support, 12 ... Bracket, 12a, 12b ... Shaft support hole, 12c ... Large hole, 12d ... Screw hole, 12e ...
Small hole, 13 ... Male thread (male thread), 14,30 ... Motor, 15,29 ... Worm, 15a ... Shaft neck, 1
7 ... Turntable, 18 ... Tilt sensor, 19 ...
... Spring, 21 ... Female screw (female screw portion), 22 ... Holder, 23 ... Sleeve, 24 ... Engaging portion, 26 ... Guide rod, 27 ... Rack, 28 ... Warm wheel, Q ... … Engagement point, C …… Axis center.

Claims (2)

[Scope of utility model registration request] 1. A tilt chassis, on which an optical pickup and a pickup feed mechanism are mounted, is pivotally supported on a chassis by left and right fulcrum shafts, and an engaging member provided on the tilt chassis is attached to a holder. A tilt mechanism of an optical pickup configured to control the tilt of the tilt chassis by rotationally driving a tilt shaft that engages with an engaging portion and is screwed with the holder, wherein the engaging member and the engaging member are provided. An optical pickup characterized in that the engagement portion is formed such that the joint portion and the engagement point portion include the axis of the tilt shaft and are located in the vicinity of a plane in the protruding direction of the engagement portion of the holder. Tilt mechanism. 2. A sleeve having a size such that a female screw portion is formed on the holder, a male screw portion is formed on the tilt shaft, and an upper portion of the female screw portion can be fitted substantially in an outer diameter portion of the male screw portion. The tilt mechanism of the optical pickup according to claim 1, wherein