An optical imaging lens includes a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element has negative refracting power, the periphery region of the object-side surface of the second lens element is concave and the optical-axis region of the object-side surface of the third lens element is concave. The Abbe number of the first lens element is υ1, the Abbe number of the second lens element is υ2, the Abbe number of the third lens element is υ3 and the Abbe number of the fourth lens element is υ4 to satisfy υ1+υ2+υ3+υ4≤150.000.

The present invention relates to a hybrid imaging system for photodiagnosis and phototherapy and, more particularly, to a hybrid imaging system for photodiagnosis and phototherapy, which simultaneously acquires a visible ray image or a near-infrared ray image and a lonq wave infrared ray image by using an optical method. The hybrid imaging system for photodiagnosis and phototherapy according to the present invention includes a light distribution unit, a visible ray/near-infrared ray measurement unit, a long wave infrared ray measurement unit, and a light source unit, thereby simultaneously and quickly extracting a visible ray image, a near-infrared ray image, and a long wave infrared ray image without mutual distortion.

The present invention relates to a hybrid imaging system for photodiagnosis and phototherapy and, more particularly, to a hybrid imaging system for photodiagnosis and phototherapy, which simultaneously acquires a visible ray image or a near-infrared ray image and a lonq wave infrared ray image by using an optical method. The hybrid imaging system for photodiagnosis and phototherapy according to the present invention includes a light distribution unit, a visible ray/near-infrared ray measurement unit, a long wave infrared ray measurement unit, and a light source unit, thereby simultaneously and quickly extracting a visible ray image, a near-infrared ray image, and a long wave infrared ray image without mutual distortion.

Various lens designs for use in Time of Flight (ToF) sensor systems are discussed. Improvements to a ToF sensor system may be realized by, for example, incorporating a lens having particular features, such as a relatively short track length, fast lens speed (e.g., low f-number), low telecentricity, relatively flat field illumination, and fairly low cost. In some examples, such a lens of a ToF sensor system may be a lens assembly having a fixed focal length and that avoids use of lenses having aspheric surfaces so as to achieve relatively low cost.

An optical imaging lens includes a first lens element to a sixth lens element from an object side to an image side along an optical axis. A periphery region of the object-side surface of the first lens element is concave, an optical axis of the image-side surface of the first lens element is concave, a periphery region of the object-side surface of the second lens element is convex, the third lens element has negative refracting power, the fourth lens element has negative refracting power, a periphery region of the image-side surface of the fourth lens element is concave, and a periphery region of the object-side surface of the fifth lens element is concave. Lens elements included by the optical imaging lens are only six lens elements described above.

An athermal and achromatic lens with a high resolution while further being near orthoscopic and providing a large field of view. Further, the provided VNIR lens may utilize only three types of optical glass allowing the lens to be reduced in size, cost, and weight while further reducing or minimizing the complexity thereof.

An athermal and achromatic lens with a high resolution while further being near orthoscopic and providing a large field of view. Further, the provided VNIR lens may utilize only three types of optical glass allowing the lens to be reduced in size, cost, and weight while further reducing or minimizing the complexity thereof.

An optical imaging lens includes a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element has negative refracting power, the periphery region of the object-side surface of the second lens element is concave and the optical-axis region of the object-side surface of the third lens element is concave. The Abbe number of the first lens element is υ1, the Abbe number of the second lens element is υ2, the Abbe number of the third lens element is υ3 and the Abbe number of the fourth lens element is υ4 to satisfy υ1+υ2+υ3+υ4≤150.000.

An optical lens assembly includes, in order from the object side to the image side: a stop, a first lens element, a second lens element, a third lens element, and an infrared bandpass filter. An entrance pupil diameter of the optical lens assembly is EPD, a half of a maximum field of view of the optical lens assembly is HFOV, and the following condition is satisfied: 0.59<EPD/tan(HFOV)<1.33.

A Mid-Wave Infrared (MWIR) objective lens having an F # of 2.64 and a 33.6° angular field of view. It is deployed, with a focal plane and scanning system, on an airborne platform for remote sensing applications. Focal length is 9 inches, and the image is formed on a focal plane constituting CCD or CMOS with micro lenses. The lens has, from object to image, three optical element groups with a cold shield/aperture stop. Group 1 has a positive optical power and three optical elements; Group 2 has a positive optical power and four optical elements; Group 3 has a positive optical power and three optical elements. The objective lens is made of two Germanium and Silicon. The lens is both apochromatic and orthoscopic, and corrected for monochromatic and chromatic aberrations over 3.3 to 5.1 micrometers.