US 4,150,833 AGranted

Video/audio disc reproducing apparatus

AssigneeVictor Company of Japan, Ltd.

InventorTakashi Yamamura

Life of this patent

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Abstract

The disc reproducing apparatus of the invention comprises low- and high-speed belt drive mechanism for playback and forward/backward operations. The latter comprises speed change means which in response to the operation of a feed-forward or a feed-backward button reduces its speed to a medium speed level suitable for searching a desired portion of the record grooves. A carriage on which a pickup arm with a needle is mounted includes a means for selectively seizing the low- and high-speed belts so as to be driven at the low or high speed relative to the turntable. A loop-and-finger arrangement is included to serve as a means for moving the pickup needle between upper and lower positions at a variable speed in response to the selective operation of the belt catch means. A manual control lever is provided to release the belt catch means to allow the carriage to be manually moved to the original position while at the same time to raise the needle to the upper position when the power supply is cut off during playback operations.

Apparatus for controlling a transducer assembly with respect to a disc type record medium, comprising:

a first drive belt;
means for driving said first belt at a first speed;
a second drive belt;
means for driving said second belt at a speed higher than said first speed;
first means arranged to couple a transducer assembly to a portion of said first drive belt for providing motion to said assembly toward the center of said disc;
second means arranged to couple said transducer assembly to different portions of said second drive belt for providing motion to said assembly toward and away from the center of said disc;
a loop structure including an inclined working section extending at an angle to the surface of said second belt and movable between first and second positions in coaction with said first coupling means;
a pivot shaft rotatable about the axis thereof;
a resilient finger having a hooked end and projecting through said loop structure from said pivot shaft toward said second belt to an extent that when said loop structure is moved from said first to second positions the hooked end is disengaged from contact with said working section and comes into contact with a portion of said second belt, whereby said hooked end is driven by said second belt so that said pivot shaft is rotated until the hooked end is disengaged from contact with said second belt, and when said loop structure is moved from said second to first positions said finger comes into contact with one end of said working section of said loop structure to provide sliding motion to said finger toward the other end of said inclined working section so that said pivot shaft is rotated in a reverse direction and
third means to couple said transducer assembly to said pivot shaft such that said transducer assembly is in a raised, noncontact position and a lowered, contact position with the surface of said record medium in response to said loop structure being in said first and second positions, respectively.

7 more elements

Facts

Application

05/870,321Filed 18 Jan 1978 · continuation

Priority

JP 50-9896418 Jul 1975

Granted

24 Apr 1979

Term ends

Not estimatedThe source records don’t support an estimate.

Classification3 codes

G11B 3/08
Arrangements of heads: raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers
G11B 3/08558
For pick-up arms moving parallel to itself: driven by belt or analogous element
G11B
Information storage based on relative movement between record carrier and transducer

Abstract

Claims5