Blocker having light transmission and reflection device

A blocker (10) comprising:

• an illumination light source (14) configured to emit illumination light that illuminates a lens (L);
• a light transmission and reflection device (20) configured to reflect or transmit the illumination light;
• an image sensor (11) configured to detect the illumination light reflected by the light transmission and reflection device (20) to thereby obtain an image of the lens (L);
• a lens meter (12) configured to detect the illumination light that has passed through the light transmission and reflection device (20) to thereby measure characteristics of the lens (L);
• and
• a blocking member (70) configured to attach a leap block (B) to the lens (L),
• wherein the light transmission and reflection device (20) comprises:
• a first reflection plate (41) having a central hole (2) formed in a center thereof;
• a first rotating cylinder (44) configured to be coupled to the first reflection plate (41) and to rotate the first reflection plate (41);
• a second rotating cylinder (43) configured to be located inside the first rotating cylinder (44) and to rotate the first rotating cylinder (44);
• a second reflection plate (42), the position of which is adjusted by the second rotating cylinder (43) and which is configured to open or block the central hole (2) formed in the first reflection plate (41);
• and driving means (13) configured to drive the second rotating cylinder (43).