JP3800377B2 - Pickup unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pickup unit that accesses a recording medium while moving the pickup.
[0002]
[Prior art]
Conventionally, a pickup unit applied to a video CD changer has a PU chassis that has a rectangular window frame and is supported vertically, a rail member that is horizontally supported along the rectangular window frame, and the rail member. While being supported slidably, the edge of the rectangular window frame is supported by the concave groove so that it can move linearly, and reading is performed based on reflected light while irradiating a predetermined recording medium with reading light. A pickup for transmitting a signal, and a PU spacer that is mounted on the concave groove and adjusts the gap between the edge of the rectangular window frame. The PU chassis is provided with a feed gear supported so as to be rotationally driven by a stepping motor, and meshes with a rack gear disposed on the pickup.
[0003]
With this configuration, when the stepping motor rotates, it can slide with respect to the rail member supported horizontally along the rectangular window frame formed in the PU chassis supported in the vertical direction via the feed gear and the rack gear. The supported pickup is moved back and forth by holding the edge of the rectangular window frame by the concave groove while being supported. Then, the pickup sends out a read signal based on the reflected light while irradiating the predetermined recording medium with the read light.
[0004]
At this time, since the concave groove is formed wider than the thickness of the edge of the rectangular window frame, by attaching a PU spacer to the concave groove, the edge of the rectangular window frame and the concave groove Adjusting the distance between the pickups prevents the pickup from rattling.
[0005]
[Problems to be solved by the invention]
In the conventional pickup unit described above, when the PU spacer is mounted in the concave groove, a gap of about 0.2 mm is generated between the PU chassis and the PU spacer. In consideration of the dimensional error, the gap could not be further reduced, and the pickup rattling could not be sufficiently prevented. For this reason, when a force such as vibration is applied, the pickup rattles due to the gap, and audio skipping and image skipping occur during access.
[0006]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a pickup unit capable of preventing audio skipping and image skipping during access.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a support plate that is formed in a frame shape having a substantially rectangular window portion having upper and lower edges extending in a direction along each other and supported in the vertical direction. A rail member oriented in a substantially horizontal direction along the lower edge of the window, and an upper edge of the window by the groove while being slidably supported by the support groove with respect to the rail member A pickup that can move linearly by two-point support by holding the portion and sends a reading signal based on reflected light while irradiating the predetermined recording medium with the reading light, and the pickup along the rail member comprising a driving mechanism for moving back and forth Te, the groove is, the vertical direction is opened upward is formed by the wide-formed concave groove against the upper thickness of the edge, and, the Jimizo is being opened in the thickness direction of the support plate, while inserting the upper side of the edge to the concave grooves, the said support groove in the rail member by causing incorporated addition from the thickness direction of the support plate The pickup can be moved linearly by two-point support, and the ring portion of the spacer provided with the ring portion is attached to the side wall on one side of the concave groove, so that the ring portion is placed on the upper side inside the side wall. It is opposed to the edge, the concave by urging by the spring portion by the parallax against the said support plate at a position away a free end formed on the spherical surface of the spring portion that extends from the ring portion from the upper side of the edge The side wall on the other side of the groove and the above-described edge portion are brought into close contact with each other to prevent the pickup from rattling.
[0008]
In the invention according to claim 1 configured as described above, the drive mechanism is a rail member oriented in a substantially horizontal direction along a substantially rectangular window formed on a support plate supported in the vertical direction. On the other hand, the pickup which is supported at two points by moving the edge of the window portion by the groove while moving slidably is moved back and forth. Then, the pickup sends out a read signal based on the reflected light while irradiating the predetermined recording medium with the read light.
[0009]
At this time, the spacer is attached to the groove and adjusts the gap with the edge of the window.
[0010]
The recording medium referred to here may be a video CD or a music CD as long as it is accessible by the pickup from the viewpoint that the present invention has a characteristic in the configuration of the pickup unit, and may be an MD. Or LD.
[0011]
The support plate only needs to be formed in a frame shape having a substantially rectangular window and supported in the vertical direction. Since the support plate having this configuration is supported in the vertical direction, the substantially rectangular window portion includes upper and lower edges extending in a direction along each other.
[0012]
The rail member only needs to be oriented in a substantially horizontal direction along the lower window portion.
[0013]
The pickup is slidably supported with respect to the rail member, and can be linearly moved by two-point support by holding the edge of the upper window portion by a groove portion, and can also read a predetermined recording medium Any structure that can transmit a read signal based on reflected light while irradiating light may be used.
[0014]
The drive mechanism may be configured to be capable of moving the pickup back and forth along the rail member, and may be configured by a rack gear connected to a stepping motor via a gear mechanism. It may be connected to a stepping motor via a wire or a belt.
[0015]
【The invention's effect】
As described above, the present invention can provide a pickup unit capable of preventing audio skipping and image skipping during access.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the main structure of a video CD changer according to an embodiment of the present invention. For convenience of explanation, in FIG. 1, the lower left is called the front side and the lower right is called the right side .
[0017]
The video CD changer 10 is formed in a casing shape including a chassis 20 and a cover 30, and a plurality of video CDs or music CDs (hereinafter simply referred to as CDs) are arranged side by side on the front side of the chassis 20. An accommodation rack 40 is fixed, and a chucker 50 for taking out and reproducing one of the video CDs is supported on the rear side so as to be movable in the left-right direction.
[0018]
The storage rack 40 includes 51 slits 41 that open in the vertical direction, and holds a total of 51 CDs of 50 sheets and one side by side in the left-right direction.
[0019]
As shown in FIGS. 1 and 2, the chucker 50 is a PU having an opening that forms a substantially rectangular window having upper and lower edges that are vertically arranged and extend in a direction along each other. A chassis 51, a CD holding unit 52 disposed on the front side of the PU chassis 51, and a pickup 53 supported so as to be able to move back and forth through the opening are provided from the storage rack 40 based on an operation instruction from a user. The taken-out CD is held in the CD holding unit 52, and the pickup 53 is accessed while moving the pickup 53 back and forth.
[0020]
The PU chassis 51 is slidably connected to rails 21 and 21 arranged in parallel in the left-right direction on the chassis 20 and is movable in the left-right direction. The chassis 20 has a meshing rack 22 fixed thereto, and the PU chassis is provided with a stepping motor (not shown) that rotates a drive gear meshing with the meshing rack 22 via a gear mechanism. The PU chassis 51 can be slid to any position on the rails 21 and 21 by rotating the stepping motor by a predetermined angle with a microcomputer that does not. Therefore, the PU chassis 51 that has an opening and is arranged while standing vertically constitutes a support plate in the present invention in this sense.
[0021]
The CD holding unit 52 includes an arm mechanism for taking out a CD from the storage rack 40, a flipper for holding the CD by sandwiching it between the PU chassis, a spindle motor for rotating the CD at a predetermined speed, and the like. Keep it accessible.
[0022]
The pickup 53 is formed of a box that is supported so as to be movable back and forth along the opening. The pickup 53 irradiates the reading light while changing the position facing the CD held by the CD holding unit 52, and the obtained reflection. A reading signal is transmitted based on the light.
[0023]
As shown in FIG. 3, the pickup 53 includes a concave groove 53a opened upward in the vertical direction and a support groove 53b opened in the thickness direction of the PU chassis 51, and the PU chassis 51 is provided in the concave groove 53a. By inserting the support groove 53b from the right side (thickness direction of the PU chassis 51 as a support plate) into the rail member 51b disposed at the lower opening of the PU chassis 51 while inserting the opening edge 51a of Is supported so as to be movable.
[0024]
The concave groove 53a, as shown in FIG. 4, for which relative thickness of the opening edge portion 51a is formed in a wide width, a gap is formed between the same opening edge 51a and the concave groove 53a. Therefore, in order to reduce the width of the gap so as not to hinder the movement of the pickup 53 back and forth as described above, a ring portion 54a that can be inserted through the left side wall of the concave groove 53a is provided as shown in FIG. The PU spacer 54 is mounted in the concave groove 53a. However, there is a limit in adjusting the width of the gap due to a dimensional error in the manufacturing process of the PU spacer 54, and the ring portion 54a can strictly eliminate the gap and prevent rattling of the pickup 53. I can't.
[0025]
Therefore, as shown in the drawing, the PU spacer 54 according to the present embodiment is formed with a spring portion 54b extending from one end of the ring portion 54a. Since the spring portion 54b having such a configuration urges the PU chassis 51 from the left side, as shown in FIG. 6, the PU chassis 51 is urged by the spring portion 54b, and the upper opening edge portion 51a and the concave groove 53a It is possible to prevent the pickup 53 from rattling even when a slight gap is generated between the opening edge 51a and the concave groove 53a.
[0026]
In addition, the free end of this spring part 54b is formed in the spherical surface, and is urging | biasing the PU chassis 51 by one point on a spherical surface. For this reason, since the part which contacts between the PU chassis 51 and the PU spacer 54 is minimized, and the pickup 53 is less likely to be worn away, the durability of the PU spacer 54 is improved.
[0027]
Thus, the PU spacer 54 that adjusts the width of the gap by inserting the ring portion 54a into the left side wall of the concave groove 53a while urging the PU chassis 51 from the left side by the spring portion 54b is the meaning of the present invention. This constitutes a spacer.
[0028]
A rack gear 55 is disposed at the lower end of the pickup 53 so as to be able to advance and retreat in the front-rear direction. A feed gear 56 is rotatably supported on the right wall surface of the PU chassis 51 while meshing with the rack gear 55. The feed gear 56 is connected to a stepping motor 57 via a gear mechanism. When the stepping motor 57 is driven based on an instruction from a microcomputer (not shown), the feed gear 56 rotates and the pickup 53 is connected via the rack gear 55. Driven back and forth. In this sense, the rack gear 55, the feed gear 56, the stepping motor 57, and the like constitute a drive mechanism referred to in the present invention.
[0029]
Next, the operation of the video CD changer according to this embodiment will be described. When the user selects and plays a desired CD on an operation panel (not shown), when the microcomputer rotates the stepping motor by a predetermined angle, the drive gear is rotated through the gear mechanism, and the PU chassis 51 is Slide on the rails 21 and 21 to the position facing the CD.
[0030]
When the arm mechanism takes out the CD from the storage rack 40 and holds the CD between the PU chassis 51 and the flipper, the spindle motor rotates the CD at a predetermined speed.
[0031]
When the microcomputer drives the stepping motor 57 to rotate, the feed gear 56 rotates, so that the rack gear 55 that meshes with the feed gear 56 moves back and forth. Then, the pickup 53 moves back and forth by sliding the support groove 53b along the rail member 51b while sliding the concave groove 53a along the opening edge 51a of the PU chassis 51.
[0032]
The optical pickup provided in the pickup 53 accesses the CD that rotates at a predetermined speed while adjusting the position based on an instruction from the microcomputer, and reads the recorded information.
[0033]
At this time, the PU spacer 54 mounted in the concave groove 53a of the pickup 53 urges the PU chassis 51 to closely contact the opening edge 51a and the PU chassis 51, thereby preventing the pickup 53 from rattling. .
[0034]
As described above, the PU spacer 54 mounted in the concave groove 53a of the pickup 53 urges the PU chassis 51 to prevent the pickup 53 from rattling, so that the video CD held by the CD holding unit 52 is accessed. It is possible to prevent audio skipping and image skipping.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a main configuration of a video CD changer according to the present embodiment.
FIG. 2 is a front view showing a main configuration of the chucker.
FIG. 3 is a side view showing the main configuration of the chucker.
FIG. 4 is a schematic view showing a situation where an opening edge is inserted into a concave groove.
FIG. 5 is a perspective view showing a configuration of a PU spacer.
FIG. 6 is a schematic view when a PU spacer is mounted in a concave groove.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Video CD changer 50 ... Chucker 51 ... PU chassis 51a ... Opening edge part 51b ... Rail member 53 ... Pickup 53a ... Concave groove 53b ... Support groove 54 ... PU spacer 54a ... Ring part 54b ... Spring part

Claims (1)

A support plate formed in a frame shape having a substantially rectangular window portion having upper and lower edge portions extending in directions along each other and supported in the vertical direction, and substantially along the lower edge portion of the window portion. The rail member is horizontally movable by two-point support by holding the upper edge of the window portion by the groove portion while being slidably supported by the support groove with respect to the rail member and the rail member. And a pickup that sends a reading signal based on reflected light while irradiating the predetermined recording medium with reading light, and a drive mechanism that moves the pickup back and forth along the rail member,
The groove portion is formed by a concave groove that is open upward in the vertical direction and is formed wider than the thickness of the upper edge portion, and the support groove is open in the thickness direction of the support plate. Thus, the pickup can be linearly moved by two-point support by inserting the support groove into the rail member from the thickness direction of the support plate while inserting the upper edge into the concave groove. With
A spring part extending from the ring part by attaching the ring part of the spacer having the ring part to the side wall on one side of the concave groove so that the ring part is opposed to the upper edge part inside the side wall. close contact with the edge of the side wall and the upper other side of the concave groove by urging by the spring portion by the parallax against the said supporting plate a free end which is formed in a spherical at a position apart from the upper side of the edge of the A pickup unit characterized in that it prevents rattling of the pickup.

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