US 12,248,238 B2
Light source for ophthalmic applications
Adriaantje Coliene Dam-Huisman, Delfgauw (NL)
Assigned to Crea IP B.V., Vierpolders (NL)
Appl. No. 17/418,285
Filed by Crea IP B.V., Vierpolders (NL)
PCT Filed Dec. 19, 2019, PCT No. PCT/NL2019/050859
§ 371(c)(1), (2) Date Jun. 25, 2021,
PCT Pub. No. WO2020/139084, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2022322 (NL), filed on Dec. 28, 2018.
Prior Publication US 2022/0026791 A1, Jan. 27, 2022
Int. Cl. G03B 21/20 (2006.01); A61F 9/008 (2006.01); G03B 33/12 (2006.01)
CPC G03B 21/204 (2013.01) [A61F 9/008 (2013.01); G03B 33/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A light source for providing a light beam having a predetermined spectral content to an ophthalmic instrument, the light source comprising:
a first light source device for providing a first beam of light along a first optical axis and with a radiation opening angle, the first light source device arranged on the first optical axis and comprising
a layer of wavelength conversion material, which during operation, is exposed to exciting radiation originating from the first light source device to produce the first beam of light, the layer of wavelength conversion material attached to the first light source device,
a mirror body having a mirror surface comprising a mirror aperture centered on the first optical axis, wherein a part of the first beam of light exits the mirror body through the mirror aperture and a remaining part of the first beam of light contacts the mirror surface and is reflected back to the layer of wavelength conversion material,
a second light source device for providing a second beam of light along a second optical axis,
a dichroic mirror adapted to combine the first beam of light and the second beam of light into a combined beam of light, wherein the dichroic mirror is arranged to reflect light originating from the first light source and to transmit light originating from the second light source, and
an achromatic optical system having a numerical aperture of at least 0.55 and comprising a first lens with a first refractive index and a second lens with a second refractive index, wherein the first lens has a receiving surface with a first radius, a contact surface between the first and second lenses has a shared radius which is larger than the first radius, and the second lens has an output surface that is flat.