US5072154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic luminosity control device for car and motor bicycle headlamps
Assignee: Individual
•
Filing: 1990-03-13
•
Granted: 1991-12-10
•
Expires: 2010-03-13
Abstract
Abstract A luminosity control device includes a photosensitive member to control the duty cycle of a square wave pulse oscillator. Then a high power switching tube and a high power gain tube are used to proceed with the luminosity control. Thus, when two cars meet, the luminosity of headlamps will automatically weaken so as not to dazzle the driver's eyes in the opposite direction. Should no car come in the opposite direction, the headlamps will automatically intensify the luminosity thereof. In this manner, it is possible to effectively control the luminosity of headlamps and thereby achieve the object of traffic safety.
Inventors
- 👤 Min-Hsiung Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:47
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/02; B60Q1/04; B60Q1/14; B60Q1/1415; B60Q1/1423; B60Q2300/00; B60Q2300/05; B60Q2300/054; B60Q2300/30; B60Q2300/31; B60Q2300/314; B60Q2300/40; B60Q2300/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
An automatic luminosity control device for a car or a motor bicycle headlamps, comprising a photosensitive member (Ru) being set in the front of said car or motorcycle, and a variable bistable oscillator comprising a first transistor (Q1), a second transistor (Q2), a capacitor (C2), said photosensitive member (Ru), a first resistor (R1), a second resistor (R2), a third resistor (R3) and a fourth resistor (R4), said headlamps comprising distance light means and dim light means, said distance light means and dim light means being connected with said variable bistable oscillator whereby when the said photosensitive member is activated, the luminosity of said distance light means is gradually reduced while the luminosity of said dim light means is increased.
Claim 2
Dependent Claim
119 words
An automatic luminosity control device for a car or a motor bicycle headlamps, comprising a photosensitive member (Ru) being set in the front of said car or motorcycle, and a variable bistable oscillator comprising a first transistor (Q1), a second transistor (Q2), a capacitor (C2), said photosensitive member (Ru), a first resistor (R1), a second resistor (R2), a third resistor (R3) and a fourth resistor (R4), said headlamps comprising distance light means and dim light means, said distance light means and dim light means being connected with said variable bistable oscillator whereby when the said photosensitive member is activated, the luminosity of said distance light means is gradually reduced while the luminosity of said dim light means is increased.
References Cited (Backward Citations)
US4587457A
Cited
US4645975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-09 | 1995-06-10 | 1995-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-09 | 1999-06-10 | 1999-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-09 | 2003-06-10 | 2003-12-10 | $7700.00 | Window Closed / Lapsed |