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EP0168668A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Flexible disk apparatus

Assignee: Mitsubishi Electric Corp
•
Filing: 1985-06-20
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Granted: —
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Expires: 2005-06-20
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Abstract

Abstract A flexible disk apparatus comprises a carriage for moving a magnetic head to a specified position of data tracks in a storage medium, a motor for driving the carriage depending on excitation pulses from a step motor, a light shielding plate mounted on the carriage, a light-emitting element (11a), a light-sensitive element (11b) opposing to the light-emitting element through the light shielding plate, and a position-judging means (13) for judging the position of the magnetic head depending on the excitation pulses of the step motor and a signal of the light-sensitive element generated when light is shielded by the light-shielding- plate. To reduce power consumption in a stand-by mode, the power source is disconnected (15) from the element (11). Although no light falls on the light-sensitive element (11b), an erronous zero-condition is not detected because the element (11b) is also disconnected from the power source.

Inventors

  • 👤 Masaru Sasaki
  • 👤 Shin Isozaki

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 07:27
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; G11B5/00; G11B5/012; G11B5/016; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B5/5526

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 149 words
A flexible disk apparatus comprising a carriage for moving a mägnetic head to a specified position of data tracks in a storage medium, a motor for driving said carriage depending on excitation pulses from a step motor, a light shielding plate mounted on said carriage, a light-emitting element, a light-sensitive element opposing to said light-emitting element through said light shielding plate and a position-judging means for judging the position of said magnetic head depending on said excitation pulses of the step motor and a signal of said light-sensitive element generated when light is shielded by said light-shielding plate, characterized in that said light-emitting element (lla) and said light-sensitive element (llb) are connected to a power source through a common switching element (15) and the position-judging means (13) outputs a signal as if generated from said light-sensitive element when said element is sensing light, said switching element being turned off.
Claim 2
Dependent Claim 149 words
A flexible disk apparatus comprising a carriage for moving a mägnetic head to a specified position of data tracks in a storage medium, a motor for driving said carriage depending on excitation pulses from a step motor, a light shielding plate mounted on said carriage, a light-emitting element, a light-sensitive element opposing to said light-emitting element through said light shielding plate and a position-judging means for judging the position of said magnetic head depending on said excitation pulses of the step motor and a signal of said light-sensitive element generated when light is shielded by said light-shielding plate, characterized in that said light-emitting element (lla) and said light-sensitive element (llb) are connected to a power source through a common switching element (15) and the position-judging means (13) outputs a signal as if generated from said light-sensitive element when said element is sensing light, said switching element being turned off.
Claim 3
Dependent Claim 20 words
The flexible disk apparatus according to claim 1, characterized in that said switching element is a PNP junction transistor (15).
Claim 4
Dependent Claim 26 words
The flexible disk apparatus according to claim 1 or 2, characterized in that a resistor (R ) is connected in parallel to said light-emitting element (lla).
Claim 5
Dependent Claim 32 words
The flexible disk apparatus according to one of claims 1 to 3, characterized in that an inversion and amplification circuit (14) is inserted at the output side of said light-sensitive element (lla).
Claim 6
Dependent Claim 26 words
The flexible disk apparatus according to claim 1, characterized in that a NOR circuit (17) is inserted at the output side of said light-sensitive element (lla).

References Cited (Backward Citations)

DE2340978A1 Cited
US4325016A Cited
EP0055353A1 Cited

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