JPS54146485A - Beam bulb - Google Patents
Beam bulbInfo
- Publication number
- JPS54146485A JPS54146485A JP5442678A JP5442678A JPS54146485A JP S54146485 A JPS54146485 A JP S54146485A JP 5442678 A JP5442678 A JP 5442678A JP 5442678 A JP5442678 A JP 5442678A JP S54146485 A JPS54146485 A JP S54146485A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens elements
- thickness
- window section
- raise
- 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.)
- Pending
Links
Abstract
PURPOSE: To prevent a beam bulb from being cracked by heat shock in the manufacturing process, by increasing the thickness of the central part of a glass lens to raise the heat capacity of the part to lower the heating temperature thereof and decreaseing the thickness of the peripheral part of the lens to raise the heating temperatue of the part.
CONSTITUTION: A hexagonal window section 21a is provided in the central part 21 of the curved lens 20 of about 110 mm in maximum diameter, about 15 mm in height and about 4 mm in thickness. Fine projections are provided on the surface of the window section. Numerous concave lens elements 23 are provided around the window section. A sealed-up step section 24 is provided around the lens elements. An infrared ray interception film 25 is coated on the inside surface of the lens 20. The inside surfaces of the lens elements 23 are roughened to minutely diffuse light. Although the diffusion angle is enlarged, the depth of the lens elements 23 can be limited at 0.8 mm or less.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5442678A JPS54146485A (en) | 1978-05-10 | 1978-05-10 | Beam bulb |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5442678A JPS54146485A (en) | 1978-05-10 | 1978-05-10 | Beam bulb |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54146485A true JPS54146485A (en) | 1979-11-15 |
Family
ID=12970383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5442678A Pending JPS54146485A (en) | 1978-05-10 | 1978-05-10 | Beam bulb |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54146485A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57205964A (en) * | 1981-06-11 | 1982-12-17 | Tokyo Shibaura Electric Co | Beamed bulb |
| JPH0714509U (en) * | 1993-08-07 | 1995-03-10 | 東芝硝子株式会社 | Front lens for halogen bulb with reflector |
-
1978
- 1978-05-10 JP JP5442678A patent/JPS54146485A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57205964A (en) * | 1981-06-11 | 1982-12-17 | Tokyo Shibaura Electric Co | Beamed bulb |
| JPH0714509U (en) * | 1993-08-07 | 1995-03-10 | 東芝硝子株式会社 | Front lens for halogen bulb with reflector |
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