Double telecentric lens
The invention provides a double telecentric lens, which comprises an objective lens, a barrel lens and a spectroscope arranged between the objective lens and the barrel lens, the objective lens comprises a first front lens group and a first rear lens group which are sequentially arranged from an obj...
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| Hauptverfasser: | , , |
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention provides a double telecentric lens, which comprises an objective lens, a barrel lens and a spectroscope arranged between the objective lens and the barrel lens, the objective lens comprises a first front lens group and a first rear lens group which are sequentially arranged from an object side surface to an imaging surface along an optical axis direction, the first front lens group has positive focal power, and the second front lens group has negative focal power. The first front lens group has negative focal power, the first rear lens group has negative focal power, the barrel lens comprises a second front lens group and a second rear lens group which are sequentially arranged from the object side surface to the imaging surface along the optical axis direction, the second front lens group has negative focal power, the second rear lens group has positive focal power, and the double-telecentric lens meets the following relational expressions: 6.6 lt; fobj/ftubet, and fobj/ftubet; the fobj is the |
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