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(12) Patent Application: | (11) CA 2196617 |
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(54) English Title: | OPTICAL ENCODER WITH VARIABLE-PHASE SINUSOIDAL OUTPUT |
(54) French Title: | MODULE A PHOTODIODES ET METHODE POUR LE FABRIQUER |
Status: | Deemed Abandoned and Beyond the Period of Reinstatement - Pending Response to Notice of Disregarded Communication |
(51) International Patent Classification (IPC): |
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(72) Inventors : |
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(73) Owners : |
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(71) Applicants : |
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(74) Agent: | |
(74) Associate agent: | |
(45) Issued: | |
(22) Filed Date: | 1997-02-03 |
(41) Open to Public Inspection: | 1998-08-03 |
Examination requested: | 1999-09-14 |
Availability of licence: | N/A |
Dedicated to the Public: | N/A |
(25) Language of filing: | English |
Patent Cooperation Treaty (PCT): | No |
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(30) Application Priority Data: | None |
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The general purpose of the invention is to produce a sinusoidal output
wave whose phase shift will be proportional to the angular shaft position. A
single rotation of the shaft produces a large number of cycles of the sine
wave.
The amplitude and frequency of the sine-wave output are both constant, and the
sine-wave output continues at the same amplitude and frequency even when the
shaft angle is stationary. A single source of light is used to illuminate a
large
number of closely spaced detectors, and the light intensity is constant in
time.
The light passes through an optical disk with a pattern of alternately light
and
dark radial lines on it, arranged in a circumferential array, which modulate
the
transmitted light to produce a sinusoidal pattern of illumination of an array
of
detectors. The array of closely-spaced detectors is scanned serially at high
speed to produce a continuous stream of analog output data which emulates the
output produced by a resolver or LPDT (see Ref. 1).
A distinguishing characteristic of the device is that it is not necessary, or
even desirable, to digitally sample the output signal as is done in Ref. 2.
Instead,
the output signal is processed in its' original analog form by an ASIC
(Application Specific Integrated Circuit) which is generic in nature, and not
specifically designed for optical encoders. A second distinguishing
characteristic
of the device is that a single optical source of illumination can be used at
constant intensity, which greatly simplifies the optical characteristics of
the
device, while other devices of this type typically require pulsing and/or time
phase-shifting of multiple optical sources relative to each other (see Ref.
3).
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
2024-08-01:As part of the Next Generation Patents (NGP) transition, the Canadian Patents Database (CPD) now contains a more detailed Event History, which replicates the Event Log of our new back-office solution.
Please note that "Inactive:" events refers to events no longer in use in our new back-office solution.
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Description | Date |
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Letter Sent | 2007-11-06 |
Application Not Reinstated by Deadline | 2004-05-12 |
Inactive: Dead - No reply to s.30(2) Rules requisition | 2004-05-12 |
Deemed Abandoned - Failure to Respond to Maintenance Fee Notice | 2004-02-03 |
Inactive: Abandoned - No reply to s.30(2) Rules requisition | 2003-05-12 |
Inactive: S.30(2) Rules - Examiner requisition | 2002-11-12 |
Inactive: Office letter | 2002-03-12 |
Inactive: Delete abandonment | 2002-03-12 |
Inactive: Office letter | 2002-02-19 |
Deemed Abandoned - Failure to Respond to Maintenance Fee Notice | 2002-02-04 |
Letter Sent | 1999-09-23 |
Inactive: Application prosecuted on TS as of Log entry date | 1999-09-23 |
All Requirements for Examination Determined Compliant | 1999-09-14 |
Request for Examination Requirements Determined Compliant | 1999-09-14 |
Inactive: Cover page published | 1999-07-19 |
Inactive: Prior art correction | 1999-07-19 |
Letter Sent | 1999-04-15 |
Reinstatement Requirements Deemed Compliant for All Abandonment Reasons | 1999-04-06 |
Inactive: Office letter | 1999-04-01 |
Inactive: Inventor deleted | 1999-02-12 |
Deemed Abandoned - Failure to Respond to Maintenance Fee Notice | 1999-02-03 |
Inactive: Transfer information requested | 1998-12-30 |
Letter Sent | 1998-12-08 |
Reinstatement Requirements Deemed Compliant for All Abandonment Reasons | 1998-10-09 |
Inactive: Status info is complete as of Log entry date | 1998-09-28 |
Deemed Abandoned - Failure to Respond to Notice Requiring a Translation | 1998-09-02 |
Application Published (Open to Public Inspection) | 1998-08-03 |
Inactive: Incomplete | 1998-06-02 |
Abandonment Date | Reason | Reinstatement Date |
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2004-02-03 | ||
2002-02-04 | ||
1999-02-03 | ||
1998-09-02 |
The last payment was received on 2003-01-10
Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following
Patent fees are adjusted on the 1st of January every year. The amounts above are the current amounts if received by December 31 of the current year.
Please refer to the CIPO
Patent Fees
web page to see all current fee amounts.
Fee Type | Anniversary Year | Due Date | Paid Date |
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Registration of a document | 1998-10-09 | ||
1998-10-09 | |||
1998-10-09 | |||
Reinstatement | 1999-04-06 | ||
MF (application, 2nd anniv.) - small | 02 | 1999-02-03 | 1999-04-06 |
Request for examination - small | 1999-09-14 | ||
MF (application, 3rd anniv.) - small | 03 | 2000-02-03 | 1999-12-02 |
MF (application, 4th anniv.) - small | 04 | 2001-02-05 | 2001-01-15 |
MF (application, 5th anniv.) - small | 05 | 2002-02-04 | 2002-01-31 |
MF (application, 6th anniv.) - small | 06 | 2003-02-03 | 2003-01-10 |
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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HOHNER SHAFT ENCODER, CORP. |
WALTER BLOECHLE |
HOHNER CORP. |
Past Owners on Record |
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None |