AntiGlare Device

• US 20140063377A1
• Filed: 10/17/2011
• Published: 03/06/2014
• Est. Priority Date: 10/15/2010
• Status: Abandoned Application

• Current Assignee: Donata Castelberg, Manfred Castelberg, Stefan Gunz
• Original Assignee: Donata Castelberg, Manfred Castelberg, Stefan Gunz
• Inventors: Castelberg, Donata, Gunz, Stefan, Castelberg, Manfred
• Application Number:
  US13/879,463
• Publication Number:
  US 20140063377A1
• Time in Patent Office: Days
• US Class Current: 349/14
• CPC Class Codes: A61F 9/067 with variable transmission
• CPC Class Codes: G01J 1/0411 using focussing or collimating elements, i.e. lenses or mirrors; Aberration correction
• CPC Class Codes: G01J 1/0437 using masks, aperture plates, spatial light modulators, spatial filters, e.g. reflective filters
• CPC Class Codes: G01J 1/4228 arrangements with two or more detectors, e.g. for sensitivity compensation
• CPC Class Codes: G01J 1/44 Electric circuits for command of an exposure part G03B7/02
• CPC Class Codes: G02F 1/13318 Circuits comprising a photodetector

Abstract

Electro-optical glare protection device for protective glasses, protective helmets or protective masks comprising at least two optical sensors, which are equipped to detect the luminance of an object field and which have a different characteristic for the angle-dependent relative sensitivity (S₀). In particular, at least a first sensor comprises a first photodiode (1) having a narrow detection angle θ₁<45° and a second sensor comprises a second photodiode (2) with a wide detection angle θ₂>45°. An electronic circuitry for controlling the optical transmittance of a liquid crystal cell comprises differential circuit which generates a differential current (i_Δ) from photocurrents (i₁, i₂) generated by the respective photodiocies (1, 2), which differential current (i_Δ) serves as a control signal for controlling the liquid crystal cell.

Claims

1. Electro-optical glare protection device for protective glasses, protective helmets or protective masks, comprising at least two sensors and an electronic circuit for controlling the optical transmission of at least one liquid crystal cell (LCD1, LCD2), characterized in that the at least two sensors are optical sensors (S1, S2) for detecting the luminance [cd/m²] of an object field, which sensors (S1, S2) have a different characteristic for the angle-dependent relative sensitivity (S₀).

2. Electro-optical glare protection device according to claim 1, characterized in that at least a first optical sensor (S1) has a detection angle of θ

₁<

45° and

at least a second optical sensor (S2) has a detection angle θ

₂>

45°

.

3. Electro-optical glare protection device according to claim 2, characterized in that the optical sensors (S1, S2) comprise photodiodes (1, 2), which are provided with different high-refraction optical lenses.

4. Electro-optical glare protection device according to claim 1, characterized in that the electronic circuitry for controlling the transmission of at least one liquid crystal cell (LCD1, LCD2) comprises a differential circuit which generates a differential current (i_Δ

) from the photocurrents (i₁, i₂) generated by the respective sensors (S1, S2).

5. Electro-optical glare protection device according to claim 4, characterized in that the electronic circuitry for controlling the transmission of the at least one liquid crystal cell comprises a comparator (IC1, IC2) which receives the differential current (i_Δ

) and comprises an internal or external reference.

6. Electro-optical glare protection device according to claim 5, characterized in that the electronic circuitry for controlling the transmission of the at least one liquid crystal cell (LCD1, LCD2) is adapted such that either a fixed transmission value or a variable transmission value is generatable.

7. Electro-optical glare protection device according to claim 1, characterized in that the electronic circuitry for controlling the optical transmission is switchable on and off with the aid of a permanently supplied threshold value switch (IC1).

8. Electro-optical glare protection device according to claim 1, characterized in that the electronic circuitry for controlling the optical transmission is integrated into the frame or socket thereof, i.e. is casted therein.

9. Method for operating an electro-optical glare protection device according to claim 1, characterized in that a differential current (i_Δ

) is generated with the aid of an electronic differential circuit (FIG. 1) from photocurrents (i₁, i₂) which are generated by at least two sensors—

with different characteristics for the angle-dependent relative sensitivity (S₀)—

, which sensors are measuring the luminance [cd/m2] and which differential current (i_Δ

) controls the optical transmission of at least one liquid crystal cell.

10. Protective goggles, protective helmets or protective mask with an electro-optical glare protection device according to claim 1, namely with at least two sensors (S1, S2) and an electronic circuitry for controlling the optical transmission of at least one liquid crystal cell (LCD1, LCD2), characterized in that the at least two sensors are optical sensors for the detection of luminance [cd/m2] of an object field which sensors have different characteristics for the angle-dependent relative sensitivity (S₀).