Light scanning apparatus, latent image forming apparatus and image forming apparatus

A light scanning apparatus,

• wherein a light beam emitted from a plurality of light sources is imaged on an image carrying member as a medium to be scanned via a scanning optical system including a light deflection device having a light deflector,
• in the case light deflection scanning of at least m times are necessary in order for an exposure quantity emitted to the image carrying member to reach a predetermined exposure quantity,
• wherein if a scan cycle of the light deflector is set to T1 (μs), exposure energy density necessary when exposure is completed by light deflection scanning of m times is set to Ex_m and the total exposure energy density when the image carrying member is emitted across light deflection scanning of m+k times is set to Ex_mk,
• the light scanning apparatus is configured to perform exposure satisfying the following condition:
• Ex13 mk =Ex13 m−ΔEx
• {0.14×log(T1/10)/(m+k−1)−0.05}×Ex—m<ΔEx
• ΔEx <{0.14×log(T1/10)/(m+k−1)+0.05}×Ex—m.

A light scanning apparatus,

• wherein a light beam emitted from a plurality of light sources is imaged on an image carrying member as a medium to be scanned via a scanning optical system including a light deflection device,
• in the case light deflection scanning of at least m times are necessary in order for an exposure quantity emitted to the image carrying member to reach a predetermined exposure quantity,
• wherein if one scan frequency of the light deflection device is set to fv0 (Hz), exposure energy density necessary when exposure is completed across light deflection scanning of m times is set to Ex_fv0 and another scan frequency of the light deflection device is set to fv1 (Hz), exposure energy density necessary when exposure is completed across light deflection scanning of m times is set to Ex_fv1,
• the exposure energy density of the light scanning apparatus in the case
• fv1 <fv0
• satisfies the following condition:
• Ex—fv1<Ex—fv0.