Glass and plastic mixed fixed-focus lens

The invention relates to a glass and plastic mixed fixed-focus lens. The glass and plastic mixed fixed-focus lens is composed of a glass lens and a plastic lens, and comprises a first lens (1), a diaphragm (S), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5) and a sixth lens (6), which are sequentially arranged from an object side to an image side along the optical axis; the first lens (1), the second lens (2) and the sixth lens (6) are negative focal power lenses; the third lens (3) and the fifth lens (5) are positive focal power lenses; and the fourth lens (4) is a positive or negative focal power lens. The lens in the invention has the characteristics of being large in diaphragm, confocal in day and night, and non-defocusing in a temperature range of -40 to 85 DEG C. 本发明涉及一种玻塑混合定焦镜头，由玻璃透镜和塑料透镜组成，包括：沿光轴从物侧至像侧依次排列的第一透镜(1)、光阑(S)、第二透镜(2)、第三透镜(3)、第四透镜(4)、第五透镜(5)和第六透镜(6)；所述第一透镜(1)、所述第二透镜(2)和所述第六透镜(6)为负光焦度透镜；所述第三透镜(3)和所述第五透镜(5)为正光焦度透镜；所述第四透镜(4)为正或负光焦度透镜。本发明的镜头具有大光圈，日夜共焦、-40℃～85℃温度范围内不虚焦的特