FR2285210A1 - Mfg. of Schmidt correction plate - uses thin glass plate placed over glass matrix block - Google Patents

Mfg. of Schmidt correction plate - uses thin glass plate placed over glass matrix block

Info

Publication number
FR2285210A1
FR2285210A1 FR7432074A FR7432074A FR2285210A1 FR 2285210 A1 FR2285210 A1 FR 2285210A1 FR 7432074 A FR7432074 A FR 7432074A FR 7432074 A FR7432074 A FR 7432074A FR 2285210 A1 FR2285210 A1 FR 2285210A1
Authority
FR
France
Prior art keywords
plate
glass
mfg
matrix
placed over
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7432074A
Other languages
French (fr)
Other versions
FR2285210B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CELESTRON PACIFIC
Original Assignee
CELESTRON PACIFIC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CELESTRON PACIFIC filed Critical CELESTRON PACIFIC
Priority to FR7432074A priority Critical patent/FR2285210A1/en
Publication of FR2285210A1 publication Critical patent/FR2285210A1/en
Application granted granted Critical
Publication of FR2285210B1 publication Critical patent/FR2285210B1/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/0043—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor the workpieces being deformed during the grinding operation

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The Schmidt correction plate is made by first forming a matrix (22) on a glass block by grinding and polishing, providing a negative for the required correction plate. A thin glass plate is positioned over the matrix and a vacuum is created between the glass plate and the matrix, so as to establish a glass to glass contact over the whole area of the glass plate. The glass plate and matrix block are rotated and the upper surface of the glass plate is ground flat and polished. The vacuum between the matrix block and the plate is then lifted to allow the latter, which forms the correction plate, to be removed.
FR7432074A 1974-09-23 1974-09-23 Mfg. of Schmidt correction plate - uses thin glass plate placed over glass matrix block Granted FR2285210A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7432074A FR2285210A1 (en) 1974-09-23 1974-09-23 Mfg. of Schmidt correction plate - uses thin glass plate placed over glass matrix block

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7432074A FR2285210A1 (en) 1974-09-23 1974-09-23 Mfg. of Schmidt correction plate - uses thin glass plate placed over glass matrix block

Publications (2)

Publication Number Publication Date
FR2285210A1 true FR2285210A1 (en) 1976-04-16
FR2285210B1 FR2285210B1 (en) 1980-12-19

Family

ID=9143348

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7432074A Granted FR2285210A1 (en) 1974-09-23 1974-09-23 Mfg. of Schmidt correction plate - uses thin glass plate placed over glass matrix block

Country Status (1)

Country Link
FR (1) FR2285210A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1249864A1 (en) * 2001-04-09 2002-10-16 ABB Schweiz AG Process and apparatus for reducing the thickness of wafers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1249864A1 (en) * 2001-04-09 2002-10-16 ABB Schweiz AG Process and apparatus for reducing the thickness of wafers

Also Published As

Publication number Publication date
FR2285210B1 (en) 1980-12-19

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Legal Events

Date Code Title Description
ST Notification of lapse